freeze off vs decline

freeze off is not a noun while decline is a noun.

Word	Noun	Adjective	Verb	Adverb
freeze off	No	No	Yes	No
decline	Yes	No	Yes	No

As verbs, decline is a hypernym of freeze off; that is, decline is a word with a broader meaning than freeze off:

Other hypernyms of freeze off include refuse.

freeze off (noun)	decline (noun)
	a downward slope or bend
	a gradual decrease; as of stored charge or current
	change toward something smaller or lower
	a condition inferior to an earlier condition; a gradual falling off from a better state; decline

freeze off (verb)	decline (verb)
reject with contempt	grow smaller
	grow worse
	show unwillingness towards
	inflect for number, gender, case, etc.
	go down
	fall in value
	not accept as true