Mammoth Uncensored Word List:
37 words ending with ch, 11 letters long

angletwitch backscratch backstretch bioresearch cesarevitch cesarewitch clairschach crossstitch ecclesiarch electroetch gastrotrich gillravitch gymnasiarch homestretch interbranch interchurch lightswitch lophobranch microswitch mineralrich overstretch predispatch proresearch prosobranch pulmobranch ramgunshoch schrecklich sonofabitch stripsearch superchurch symposiarch tectibranch throatlatch tsesarevich tsesarewich understitch wholestitch