Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun concussion

2 senses of concussion

Sense 1
concussion -- (injury to the brain caused by a blow; usually resulting in loss of consciousness)
       => injury, accidental injury -- (an accident that results in physical damage or hurt)

Sense 2
concussion -- (any violent blow)
       => blow, bump -- (an impact (as from a collision); "the bump threw him off the bicycle")