sealant vs caulk

sealant and caulk both are nouns.

Word	Noun	Adjective	Verb	Adverb
sealant	Yes	No	No	No
caulk	Yes	No	Yes	No

As nouns, caulk is a hyponym of sealant; that is, caulk is a word with a more specific, narrower meaning than sealant:

sealant: a kind of sealing material that is used to form a hard coating on a porous surface (as a coat of paint or varnish used to size a surface)
caulk: a waterproof filler and sealant that is used in building and repair to make watertight

Other hyponyms of sealant include caulking.

sealant (noun)	caulk (noun)
a kind of sealing material that is used to form a hard coating on a porous surface (as a coat of paint or varnish used to size a surface)	a waterproof filler and sealant that is used in building and repair to make watertight

sealant (verb)	caulk (verb)
	seal with caulking