9 letters · 18 points in Scrabble
adjective used of organisms (especially of different species) living together but not necessarily in a relation beneficial to each
originFrom symbiosis + -tic, from Ancient Greek συμβίωσις (sumbíōsis), from σύν (sún, “with”) + βίος (bíos, “life”).
Etymology from Wiktionary, CC BY-SA 3.0