Concessive vs Concussive - What's the difference?

As adjectives the difference between concessive and concussive

is that concessive is of, pertaining to, or being a concession; conceding while concussive is of, pertaining to, or causing concussion.

is (grammar) a phrase or clause that acts as a concession, such as "even if" or "although".

(en adjective)

Of, pertaining to, or being a concession; conceding

(en noun)

(grammar) A phrase or clause that acts as a concession, such as "even if" or "although".

----

(en adjective)

Of, pertaining to, or causing concussion

* subconcussive