contusion vs bruise

contusion and bruise both are nouns.

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

As nouns, contusion and bruise are synonyms defined as:

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

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

contusion (verb)	bruise (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