contusion vs shiner

contusion and shiner both are nouns.

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

As nouns, shiner is a hyponym of contusion; that is, shiner is a word with a more specific, narrower meaning than contusion:

contusion: an injury that doesn't break the skin but results in some discoloration
shiner: a swollen bruise caused by a blow to the eye

Other hyponyms of contusion include ecchymosis, petechia, black eye, mouse.

contusion (noun)	shiner (noun)
the action of bruising	any of numerous small silvery North American cyprinid fishes especially of the genus Notropis
an injury that doesn't break the skin but results in some discoloration	important food fish of the northern Atlantic and Mediterranean; its body is greenish-blue with dark bars and small if any scales
	something that shines (with emitted or reflected light)
	a swollen bruise caused by a blow to the eye