calm vs tranquillise

calm is a noun but tranquillise is not a noun.

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

As verbs, calm and tranquillise are synonyms defined as:

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

Other synonyms of calm include sedate, tranquilize, tranquillize.

As verbs, calm and tranquillise are synonyms defined as:

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

calm (noun)	tranquillise (noun)
steadiness of mind under stress
wind moving at less than 1 knot; 0 on the Beaufort scale

calm (adjective)	tranquillise (adjective)
(of weather) free from storm or wind
not agitated; without losing self-possession

calm (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 steady	make calm or still
make calm or still
become quiet or calm, especially after a state of agitation