top-notch vs tiptop

top-notch is not a noun while tiptop is a noun.

Word	Noun	Adjective	Verb	Adverb
top-notch	No	Yes	No	No
tiptop	Yes	Yes	No	No

As adjectives, top-notch and tiptop are synonyms defined as:

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

top-notch (noun)	tiptop (noun)
	the extreme top or summit
	the highest level or degree attainable; the highest stage of development

top-notch (adjective)	tiptop (adjective)
of the highest quality	of the highest quality