tops vs topnotch

tops and topnotch both are adjectives.

Word	Noun	Adjective	Verb	Adverb
tops	No	Yes	No	No
topnotch	No	Yes	No	No

As adjectives, tops and topnotch are synonyms defined as:

Other synonyms of tops include A-one, ace, crack, first-rate, super, tiptop, top-notch.

tops (adjective)	topnotch (adjective)
of the highest quality	of the highest quality