Experiment vs Test

When to use each in English, with meaning, register, and examples.

Experiment

Top 1,000 (very common)A2noun

Test

Top 1,000 (very common)A1noun
 ExperimentTest
Pronunciation🇬🇧 /["/ɪkˈsperɪmənt/"]/🇺🇸 /["/ɪkˈsperɪmənt/"]/🇬🇧 /["/test/"]/🇺🇸 /["/test/"]/
MeaningA test to find out something new.An exam to check knowledge or skills.
ExampleThe scientist conducted an experiment to test her hypothesis.I have a math test tomorrow and I need to study.
RegisterNeutralNeutral
How commonTop 1,000 (very common)Top 1,000 (very common)
CEFR levelA2A1
Part of speechnounnoun
Collocationsanimal, 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 experimentdemanding, 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
Antonymscertainty, factguess, ignore, neglect
Common mistakesConfused 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 'testify' — they mean different things., Using 'test' as a countable noun incorrectly., Mixing up 'tested' and 'testing’ in verb forms.
Usage notesUsed in scientific contexts but can also refer to trying new ideas in everyday life. More formal in academic writing.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.

Frequently asked questions: Experiment vs Test

What's the difference between Experiment and Test?

Experiment: A test to find out something new. Test: An exam to check knowledge or skills.

Are Experiment and Test the same CEFR level?

Experiment: A2, Test: A1 on the CEFR scale.

Can I use Experiment and Test interchangeably?

Not always. Experiment and Test 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.

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