I can only think of one stem in the word "concussion" which is "con". Con means together.
it is the stem
There is no stem word. If the word was clammy then the stem would be calm.
sign-if-i-cant
Polis doesn't have any wors stems! polis is actually a word stem itself polis means city. for example police has polis in it as a word stem!
"Concussion" rhymes with discussion.
Ecosystem, stemware, systematic.
Collision, shaking, shock, and bump are words. Those mean concussion.
The name for a "slight" concussion is a minor one (as opposed to major).The word miner is one who works in a mine, who also might get a concussion.
The stem word for slyly is sly.
Monomer, monotreme, monofilament, monorail, mononucleosis, monotony.
flushin' blushin' crushin'
The stem of the word monotonous is monotony.