Cool MateComplication vs Difficulty vs Obstacle vs Problem
When to use each in English, with meaning, register, and examples.
Complication
Top 2,000 (common)C1noun
Difficulty
Top 2,000 (common)B1noun
Obstacle
Top 2,000 (common)B2noun
Problem
Top 1,000 (very common)A1noun
Most common: Problem
| Complication | Difficulty | Obstacle | Problem | |
|---|---|---|---|---|
| Pronunciation | 🇬🇧 /["/ˌkɒmplɪˈkeɪʃn/"]/🇺🇸 /["/ˌkɑːmplɪˈkeɪʃn/"]/ | 🇬🇧 /["/ˈdɪfɪkəlti/"]/🇺🇸 /["/ˈdɪfɪkəlti/"]/ | 🇬🇧 //ˈɒbstəkl//🇺🇸 //ˈɑbstəkl// | 🇬🇧 /["/ˈprɒbləm/"]/🇺🇸 /["/ˈprɑːbləm/"]/ |
| Meaning | A problem or difficulty that makes something harder. | How hard something is. | Something that makes it difficult to do something. | A difficulty or issue that needs to be solved. |
| Example | The surgeon explained that there could be a complication during the procedure. | The difficulty of the exam surprised many students. | He faced many obstacles during his journey to success. | Math can be hard, but I will solve this problem. |
| Register | Neutral | Neutral | Neutral | Neutral |
| How common | Top 2,000 (common) | Top 2,000 (common) | Top 2,000 (common) | Top 1,000 (very common) |
| CEFR level | C1 | B1 | B2 | A1 |
| Part of speech | noun | noun | noun | noun |
| Collocations | major, added, additional, add, cause, avoid, arise, ensue, occur, acute, dangerous, life-threatening, develop, have, suffer, arise, develop, occur, rate, complication with, complication from, complication of, a risk of complications, complications related to something | considerable, enormous, extreme, level, encounter, experience, face, arise, lie (in something), despite a/the difficulty, in difficulty, with difficulty, considerable, enormous, extreme, level, encounter, experience, face, arise, lie (in something), despite a/the difficulty, in difficulty, with difficulty, considerable, enormous, extreme, level, encounter, experience, face, arise, lie (in something), despite a/the difficulty, in difficulty, with difficulty | face an obstacle, overcome an obstacle, see an obstacle | acute, big, enormous, host, set, be, pose, present (somebody with), arise, come up, crop up, area, spot, behaviour/behavior, problem about, problem for, problem of, an approach to a problem, the crux of the problem, the heart of the problem, complicated, difficult, easy, do, find the answer to, solve, set |
| Antonyms | solution, simplicity, resolution | easy, simple, effortless | advantage, help, facilitator | solution, answer, resolution |
| Common mistakes | Confused with 'complicating' which implies making something difficult., Using 'complication' in contexts unrelated to problems, like 'easy' situations. | Confused with 'difficult' (adjective) vs. 'difficulty' (noun), Using 'difficulties' when referring to multiple challenges, Overgeneralizing to describe feelings instead of tasks | Confusing with 'obstacle course' which is a specific kind of challenge., Using 'obstacles' when discussing non-physical challenges like fears or emotions., Mixing it up with 'obstruction', which often has legal connotations. | 'Problem' is often confused with 'trouble'—these words have slightly different meanings., Some learners may use 'problems' incorrectly with uncountable nouns., Use the phrase 'to solve a problem' instead of 'to fix a problem'. |
| Usage notes | Use 'complication' when discussing medical issues or difficulties in plans. Avoid in casual conversations unless talking about serious matters. | Often used to describe challenges in tasks, tests, or activities. Suitable in both casual and academic contexts. Avoid using in overly informal situations. | Used in contexts where something hinders progress or achievement. Typically neutral; avoid in overly casual contexts. | Use 'problem' in both formal and informal contexts. Avoid using in overly casual situations when a lighter term might fit, like 'issue' or 'challenge'. |
Frequently asked questions: Complication vs Difficulty vs Obstacle vs Problem
What's the difference between Complication, Difficulty, Obstacle, and Problem?
Complication: A problem or difficulty that makes something harder. Difficulty: How hard something is. Obstacle: Something that makes it difficult to do something. Problem: A difficulty or issue that needs to be solved.
Which is more common: Complication, Difficulty, Obstacle, and Problem?
Problem is the most common in everyday English.
Are Complication, Difficulty, Obstacle, and Problem the same CEFR level?
Complication: C1, Difficulty: B1, Obstacle: B2, Problem: A1 on the CEFR scale.
Can I use Complication, Difficulty, Obstacle, and Problem interchangeably?
Not always. Complication, Difficulty, Obstacle, and Problem 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.