Mammoth Uncensored Word List:
32 words ending with cs, 16 letters long

acousticophobics antiaphrodisiacs anticholinergics claustrophobiacs contreltophobics crystallophobics dysmorphophobics electroacoustics electromagnetics electromechanics hendecasyllabics iatromathematics koumpounophobics luposlipaphobics microelectronics ophthalmophobics osphresiophobics ostraconophobics parasympathetics pharmacodynamics pharmacogenetics pharmacogenomics pharmacokinetics phenylketonurics psychotomimetics sociolinguistics stasibasiphobics sympathomimetics syngenesophobics telephonophobics tuberculophobics virginitiphobics