seal off vs waterproof

seal off is not a noun while waterproof is a noun.

Word	Noun	Adjective	Verb	Adverb
seal off	No	No	Yes	No
waterproof	Yes	Yes	Yes	No

As verbs, waterproof is a hyponym of seal off; that is, waterproof is a word with a more specific, narrower meaning than seal off:

Other hyponyms of seal off include reseal, calk, caulk, pack.

seal off (noun)	waterproof (noun)
	a water-resistant coat
	any fabric impervious to water

seal off (adjective)	waterproof (adjective)
	not permitting the passage of water

seal off (verb)	waterproof (verb)
impose a blockade on	make watertight
make tight; secure against leakage