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The twin sisters look alike.
The twin sisters have a similar appearance.
Similar in appearance, nature, or character.
All humans are alike in their basic needs.
All humans share similar fundamental needs.
These two paintings are alike in style.
These two paintings share a similar artistic style.
Used after a linking verb (e.g., 'are', 'seem', 'become') to describe two or more things sharing a trait. Not used before a noun.
In the same way; similarly.
They treat all customers alike.
They treat all customers in the same manner.
Used as an adverb to mean 'in the same way' or 'without distinction'.
Remember that 'alike' typically appears after the verb (e.g., 'They are alike') or at the end of a clause (e.g., 'They behave alike'). It does not come before a noun.
Incorrect: 'They are alike brothers.' Correct: 'They are alike.' or 'They are like brothers.'
Old English 'gelīc' (like, similar), from Proto-Germanic '*galīkaz' (of the same form). Related to 'like' (adjective/adverb).
Alike is used after a verb or linking verb and cannot precede a noun. Incorrect: 'an alike situation'. Correct: 'The situations are alike.'