Synonyms of preventive

2 Syllables
peptic
3 Syllables
nullifier, negator, defending, medical, negators, deterrent, nullifiers
4 Syllables
sterilizers, neutralizer, antitoxins, germicide, cautionary, defensive, antitoxin, antivenin, neutralizers, sterilizer, antidote, disinfectant, prophylactic, protective
5 Syllables
precautionary, preventative, pathological, bactericide