relax vs decrease

relax is not a noun while decrease is a noun.

Word	Noun	Adjective	Verb	Adverb
relax	No	No	Yes	No
decrease	Yes	No	Yes	No

As verbs, decrease is a hypernym of relax; that is, decrease is a word with a broader meaning than relax:

Other hypernyms of relax include lessen, minify.

relax (noun)	decrease (noun)
	the act of decreasing or reducing something
	the amount by which something decreases
	a change downward
	a process of becoming smaller or shorter

relax (verb)	decrease (verb)
become less tense, rest, or take one's ease	decrease in size, extent, or range
cause to feel relaxed	make become smaller
make less taut
become loose or looser or less tight
make less active or fast
become less severe or strict
make less severe or strict
become less tense, less formal, or less restrained, and assume a friendlier manner