Showing results for "infective" instead. (You can only search for 1 word at a time unless you use the Storm or Mosaic Rhyme tools)
Or search: septic, infected, morbific, infectious, pathogenic, unhealthful
2 Syllables: SU
checklist, fetish, reddish, sexes, wreckage
3 Syllables: SUU
effective
3 Syllables: USU
affective, Alexis, collective, connective, corrective, deceptive, defective, detective, directions, directive, elective, invective, objective, perceptive, perspective, prospective, protective, receptive, reflective, respective, selective, subjective
4 Syllables: UUSU
ineffective, introspective, irrespective, retrospective

Found 32 words across 4 groupings. Skipped 5 excess words of a similar stem.