solace vs tranquillize

solace is a noun but tranquillize is not a noun.

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

As verbs, tranquillize is a hyponym of solace; that is, tranquillize is a word with a more specific, narrower meaning than solace:

Other hyponyms of solace include calm, calm down, lull, quiet, quieten, still, tranquilize, tranquillise, allay, ease, relieve, still.

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

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