18 Letter English Words
Word List:
grosgundertshausen gournay-sur-aronde guemene-sur-scorff gagnac-sur-garonne gelebovo-izbishchi glienicke-nordbahn gesnes-le-gandelin guanzhouxinnongcun gouy-sous-bellonne granges-du-villars
Some random words: chessboards chessboard chesapeake cherubically cherubical