top side vs tiptop

top side and tiptop both are nouns.

Word	Noun	Adjective	Verb	Adverb
top side	Yes	No	No	No
tiptop	Yes	Yes	No	No

As nouns, tiptop is a hyponym of top side; that is, tiptop is a word with a more specific, narrower meaning than top side:

Other hyponyms of top side include crest, crown, poll, crown, pate, poll, desktop, rooftop.

top side (noun)	tiptop (noun)
the highest or uppermost side of anything	the extreme top or summit
	the highest level or degree attainable; the highest stage of development

top side (adjective)	tiptop (adjective)
	of the highest quality