thaw vs slackening

thaw and slackening both are nouns.

Word	Noun	Adjective	Verb	Adverb
thaw	Yes	No	Yes	No
slackening	Yes	No	No	No

As nouns, slackening is a hypernym of thaw; that is, slackening is a word with a broader meaning than thaw:

thaw: a relaxation or slackening of tensions or reserve; becoming less hostile
slackening: an occurrence of control or strength weakening

Other hypernyms of thaw include loosening, relaxation.

thaw (noun)	slackening (noun)
a relaxation or slackening of tensions or reserve; becoming less hostile	an occurrence of control or strength weakening
warm weather following a freeze; snow and ice melt
the process whereby heat changes something from a solid to a liquid

thaw (verb)	slackening (verb)
become or cause to become soft or liquid