Ecosystem, stemware, systematic.
it is the stem
I can only think of one stem in the word "concussion" which is "con". Con means together.
The stem word in "significant" is "signific." This is the root form of the word before any suffixes are added.
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!
Some words that have the root "clam" in them include clamor, exclaim, and proclamation.
Words that contain the root word of naut are nautical, astronaut and astronauts.
Words that contain the word 'strain' are:constrainconstrainteyestrainrestrainrestraintstrainedstrainerunconstrainedunrestrained
Some words that contain the word "vis" in them are visible, revisited, and advised.
Not every word has a base word. Some words are considered base words themselves and do not stem from any other word.
Compound words containing the word look:lookoutoutlookoverlook
Some words that contain OUT are:aboutblowoutboutcloutdugoutfloutgroutloutmouthoutboardoutboundoutburstoutdooutdooroutletoutlineoutmatchoutplayoutpouringoutsideoutwitpoutreadoutroundaboutroutescoutshoutsnoutsouthspoutsproutstoutthroughouttouttroutyouth
Colostomy.