soothe vs tranquillize

soothe and tranquillize both are verbs.

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

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

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

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