tranquillize vs solace

tranquillize is not a noun while solace is a noun.

Word	Noun	Adjective	Verb	Adverb
tranquillize	No	No	Yes	No
solace	Yes	No	Yes	No

As verbs, solace is a hypernym of tranquillize; that is, solace is a word with a broader meaning than tranquillize:

Other hypernyms of tranquillize include comfort, console, soothe.

tranquillize (noun)	solace (noun)
	the act of consoling; giving relief in affliction
	the comfort you feel when consoled in times of disappointment
	comfort in disappointment or misery

tranquillize (verb)	solace (verb)
cause to be calm or quiet as by administering a sedative to	give moral or emotional strength to
make calm or still