Similar vs They were so alike

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

Similar

Top 2,000 (common)A1adjective

They were so alike

Top 2,000 (common)
 SimilarThey were so alike
Pronunciation🇬🇧 /["/ˈsɪmələ(r)/"]/🇺🇸 /["/ˈsɪmələr/"]/🇬🇧 //ðeɪ wəː səʊ əˈlaɪk//🇺🇸 //ðeɪ wɚ soʊ əˈlaɪk//
MeaningAlmost the same as something else.They were very similar.
ExampleThese two paintings look very similar to each other.They were so alike that people often mistook them for each other.
RegisterNeutralNeutral
How commonTop 2,000 (common)Top 2,000 (common)
CEFR levelA1-
Part of speechadjective
Collocationsbe, feel, look, extremely, fairly, very, in, toso alike that, look so alike, act so alike
Antonymsdifferent, dissimilar-
Common mistakesConfused with 'same' — 'similar' means not exactly the same., Incorrectly used for unrelated things., Using 'similar' with more than two items without clarification.Confusing with 'like' as a preposition instead of adjective., Using in formal text where 'similar' is more appropriate., Incorrect word order, like 'so alike they were'.
Usage notesUse 'similar' when comparing two or more things that share characteristics. Avoid using it for things that are not closely related.Usually used to compare two or more things. It's a friendly expression, but avoid it in formal writing.

See it in real clips

Similar
They were so alike

Frequently asked questions: Similar vs They were so alike

What's the difference between Similar and They were so alike?

Similar: Almost the same as something else. They were so alike: They were very similar.

Can you show an example of each?

Similar: These two paintings look very similar to each other. They were so alike: They were so alike that people often mistook them for each other.

Can I use Similar and They were so alike interchangeably?

Not always. Similar and They were so alike 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.

Related comparisons