tranquillise vs quieten

tranquillise and quieten both are verbs.

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

As verbs, tranquillise and quieten are synonyms defined as:

Other synonyms of tranquillise include calm, calm down, lull, quiet, still, tranquilize, tranquillize.

tranquillise (verb)	quieten (verb)
cause to be calm or quiet as by administering a sedative to	cause to be quiet or not talk
make calm or still	make calm or still
	become quiet or quieter