calm down vs cool it

calm down and cool it both are verbs.

Word	Noun	Adjective	Verb	Adverb
calm down	No	No	Yes	No
cool it	No	No	Yes	No

As verbs, calm down and cool it are synonyms defined as:

calm down and cool it: become quiet or calm, especially after a state of agitation

Other synonyms of calm down include calm, chill out, cool off, settle down, simmer down.

calm down (verb)	cool it (verb)
become quiet or less intensive	become quiet or calm, especially after a state of agitation
make calm or still
become quiet or calm, especially after a state of agitation