hoo boy, one hardly knows where to start; but here then are some *ics: academic, cosmetic, dogmatic, eclectic, endemic, elastic, organic, irenic (to pair with polemic), lexemic(!), paradigmatic(!!).

I will grant you that a few of these are rare or generally plural in the noun form but. also, fwiw, there are 5144 words in OED2 which are listed as both adj. and n., if you want to explore this further.