bump vs concussion

bump and concussion both are nouns.

Word	Noun	Adjective	Verb	Adverb
bump	Yes	No	Yes	No
concussion	Yes	No	No	No

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

Other hyponyms of bump include jar, jolt, jounce, shock, rap, strike, tap, bang, bash, belt, knock, smash, buffeting, pounding, sideswipe, slap, smack.

bump (noun)	concussion (noun)
an impact (as from a collision)	injury to the brain caused by a blow; usually resulting in loss of consciousness
something that bulges out or is protuberant or projects from its surroundings	any violent blow
a lump on the body caused by a blow

bump (verb)	concussion (verb)
knock against with force or violence
remove or force from a position of dwelling previously occupied
to play music at loud volume
to enjoy some music greatly
dance erotically or dance with the pelvis thrust forward
come upon, as if by accident; meet with
assign to a lower position; reduce in rank