bruise vs contusion

bruise and contusion both are nouns.

Word	Noun	Adjective	Verb	Adverb
bruise	Yes	No	Yes	No
contusion	Yes	No	No	No

As nouns, bruise and contusion are synonyms defined as:

bruise and contusion: an injury that doesn't break the skin but results in some discoloration

bruise (noun)	contusion (noun)
an injury that doesn't break the skin but results in some discoloration	the action of bruising
	an injury that doesn't break the skin but results in some discoloration

bruise (verb)	contusion (verb)
damage (plant tissue) by abrasion or pressure
break up into small pieces for food preparation
injure the underlying soft tissue or bone of
hurt the feelings of