solace vs tranquillise

solace is a noun but tranquillise is not a noun.

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

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

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

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