decline vs freeze off

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

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

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

Other hyponyms of decline include disdain, pooh-pooh, reject, scorn, spurn, turn down, contract out, regret, repudiate, disobey.

decline (noun)	freeze off (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

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