Not necessarily alts for -ic just ideas and ones I've seen used
-ae, -am, -ation, -able, -ance, -ate, -at, -ant, -al/-all, -ade, -age, -ac, -act, -acity, -aholic, -algia, -ar, -ard, -arian, -ariam, -ary, -ation, -ative, -anne, -asion
-cle, -cion, -cide, -cracy, -craty, -crat, -cule, -cy, -cycle, -ci, -carpe, -cèle/-cele
-er, -ea, -ette/-et, -es/-ess/-esse, -en, -ed, -el/-ell,/-elle, -ence, -ent, -ectomy, -ee, -eer, -emia, -ency, -ern, -essence, -etic, -ei, -Γ©e, -eur
-gam, -gamy, -gon, -gonic
-ic, -ix, -is, -ist, -ism, -ity/-itty, -io, -ion, -ify, -ise/-ize, -ible, -ive, -ing, -ish, -ia, -ial, -ie, -ical, -ile, -ine, -ily, -ious, -issime, -iste, -ice
-ment, -mik, -my, -mia, -misia
-or, -ous, -out, -ocity, -oholic, -orium, -opsy, -onym, -ory, -oire
-phy, -path, -pathy, -phile, -philia, -pia, -phobia, -phone, -pnea
-ship, -s, -sio, -sion, -sive/-ssive, -sentive, -sect, -some, -sophy, -sophic
-tude, -ty, -tion, -tive, -th, -tome, -tile/-tyle
Feel free to suggest more!