When comparing things, 'like' is the word that links one thing/group to another. ex. Blue --(like)-- Sea. Blue like the Sea. 'alike' is the word that comes after the things/groups are already together. ex. Apples + Pears = (alike). Apples and Pears are alike. 'likely' = "可能性", ですから それは比較のために使用されません。 ex. It's likely going to rain. Hope this helps! :)

oh!Ｉ see. Thank you very much^^