tranquillize vs tranquillise

tranquillize and tranquillise both are verbs.

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

As verbs, tranquillize and tranquillise are synonyms defined as:

tranquillize and tranquillise: cause to be calm or quiet as by administering a sedative to

Other synonyms of tranquillize include calm, sedate, tranquilize.

As verbs, tranquillize and tranquillise are synonyms defined as:

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

tranquillize (verb)	tranquillise (verb)
cause to be calm or quiet as by administering a sedative to	cause to be calm or quiet as by administering a sedative to
make calm or still	make calm or still