9 letters · 13 points in Scrabble
verb work together on a common enterprise of project
originOriginated 1595–1605 from Late Latin cooperātus, perfect passive participle of cooperor (“to work with”), see -ate (verb-forming suffix) for more. Equivalent to co- + operate. Displaced native Old English efnwyrċan.
Etymology from Wiktionary, CC BY-SA 3.0