Cool MateExperiment vs Investigation vs Research vs Test vs Trial
When to use each in English, with meaning, register, and examples.
Experiment
Top 1,000 (very common)A2noun
Investigation
Top 2,000 (common)B2noun
Research
Top 1,000 (very common)A2noun
Test
Top 1,000 (very common)A1noun
Trial
Top 1,000 (very common)B2noun
| Experiment | Investigation | Research | Test | Trial | |
|---|---|---|---|---|---|
| Pronunciation | 🇬🇧 /["/ɪkˈsperɪmənt/"]/🇺🇸 /["/ɪkˈsperɪmənt/"]/ | 🇬🇧 /["/ɪnˌvestɪˈɡeɪʃn/"]/🇺🇸 /["/ɪnˌvestɪˈɡeɪʃn/"]/ | 🇬🇧 /["/rɪˈsɜːtʃ//ˈriːsɜːtʃ/"]/🇺🇸 /["/ˈriːsɜːrtʃ//rɪˈsɜːrtʃ/"]/ | 🇬🇧 /["/test/"]/🇺🇸 /["/test/"]/ | 🇬🇧 /["/ˈtraɪəl/"]/🇺🇸 /["/ˈtraɪəl/"]/ |
| Meaning | A test to find out something new. | Looking into something to find out more about it. | The act of studying something carefully to learn more about it. | An exam to check knowledge or skills. | A test to see if something is good or works well. |
| Example | The scientist conducted an experiment to test her hypothesis. | The police launched an investigation into the missing person's case. | The research on climate change is very important for our future. | I have a math test tomorrow and I need to study. | The trial lasted for three weeks and involved numerous witnesses. |
| Register | Neutral | Neutral | Neutral | Neutral | Neutral |
| How common | Top 1,000 (very common) | Top 2,000 (common) | Top 1,000 (very common) | Top 1,000 (very common) | Top 1,000 (very common) |
| CEFR level | A2 | B2 | A2 | A1 | B2 |
| Part of speech | noun | noun | noun | noun | noun |
| Collocations | animal, field, laboratory, carry out, conduct, do, confirm something, demonstrate something, find something, by experiment, during an/the experiment, in an/the experiment, animal, field, laboratory, carry out, conduct, do, confirm something, demonstrate something, find something, by experiment, during an/the experiment, in an/the experiment | careful, close, detailed, carry out, conduct, pursue, demonstrate something, reveal something, show something, on investigation, under investigation, investigation into, the subject of an investigation, careful, close, detailed, carry out, conduct, pursue, demonstrate something, reveal something, show something, on investigation, under investigation, investigation into, the subject of an investigation | careful, detailed, in-depth, piece, carry out, conduct, do, demonstrate something, find something, identify something, degree, effort, programme/program, research in, research into, research on, an area of research, focus your research on something, somebody’s own research | demanding, difficult, gruelling/grueling, do, sit, take, result, score, conditions, in a/the test, on a/the test, test in, exhaustive, extensive, rigorous, number, series, have, undergo, carry out, take place, confirm something, demonstrate something, result, data, statistics, test for, test on, exhaustive, extensive, rigorous, number, series, have, undergo, carry out, take place, confirm something, demonstrate something, result, data, statistics, test for, test on, good, critical, crucial, pose, provide, put somebody/something to the test, case, the acid test, the litmus test, stand the test of time | fair, unfair, full, come to, face, go on, proceed, take place, begin, attorney, court, judge, at the trial, during the trial, on trial, clinical, experimental, field, carry out, conduct, do, demonstrate something, show something, find something, period, run, data, on trial, under trial, on a trial basis, trial by fire, trial and error, clinical, experimental, field, carry out, conduct, do, demonstrate something, show something, find something, period, run, data, on trial, under trial, on a trial basis, trial by fire, trial and error, real, trial to, trials and tribulations |
| Antonyms | certainty, fact | disregard, neglect, overlook | ignorance, inactivity | guess, ignore, neglect | certainty, conclusion |
| Common mistakes | Confused with 'experience' which refers to knowledge gained over time., Using 'experiments' as a verb instead of the noun form., Saying 'experimenting of' instead of 'experimenting with'. | Confused with 'invest' which means to put money into something., Using 'investigation' as a verb instead of a noun., Mixing up 'investigation' with 'inspector', which refers to a person. | Using 'research' as an uncountable noun instead of a countable noun (e.g., saying 'a research' instead of 'a piece of research'), Confusing 'research' with 'search' (research is more in-depth and analytical), Using 'research' inappropriately in non-academic contexts | Confused with 'testify' — they mean different things., Using 'test' as a countable noun incorrectly., Mixing up 'tested' and 'testing’ in verb forms. | Confused with 'trial' as a verb — remember it's primarily a noun in this context., Using 'trial' to refer to a single test when it often implies multiple evaluations., Mixing up 'trial' with 'trial run' — the latter is specifically about practice or testing something before the final version. |
| Usage notes | Used in scientific contexts but can also refer to trying new ideas in everyday life. More formal in academic writing. | Use 'investigation' in formal contexts, like police work or research. Avoid in casual conversations. | Used in academic and professional contexts. Avoid using 'research' as a verb in casual conversation; instead, use 'study' or 'look into'. | Used in educational contexts for quizzes or exams. Can also refer to trials in scientific or real-world situations. Avoid in informal contexts unless using slang. | Used in legal contexts to refer to court cases, or in general contexts to describe testing products. Avoid using in casual conversations when discussing failures. |
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Frequently asked questions: Experiment vs Investigation vs Research vs Test vs Trial
What's the difference between Experiment, Investigation, Research, Test, and Trial?
Experiment: A test to find out something new. Investigation: Looking into something to find out more about it. Research: The act of studying something carefully to learn more about it. Test: An exam to check knowledge or skills. Trial: A test to see if something is good or works well.
Are Experiment, Investigation, Research, Test, and Trial the same CEFR level?
Experiment: A2, Investigation: B2, Research: A2, Test: A1, Trial: B2 on the CEFR scale.
What part of speech are Experiment, Investigation, Research, Test, and Trial?
Experiment: noun, Investigation: noun, Research: noun, Test: noun, Trial: noun.
Can you show an example of each?
Experiment: The scientist conducted an experiment to test her hypothesis. Investigation: The police launched an investigation into the missing person's case. Research: The research on climate change is very important for our future. Test: I have a math test tomorrow and I need to study. Trial: The trial lasted for three weeks and involved numerous witnesses.
Can I use Experiment, Investigation, Research, Test, and Trial interchangeably?
Not always. Experiment, Investigation, Research, Test, and Trial are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.