Or search: cop, gob, pig, tar, tec, aide, fuzz, jack, mate, bobby, copper, holder, lawman, purser, seaman
2 Syllables: SU
foreigner
3 Syllables: SUU
auditor, chronicler, commoner, gossamer, lawgiver, monitor, officered, officers, oftener, Oliver
4 Syllables: SUUU
kilometers
4 Syllables: USUU
astrologer, astronomer, barometer, biographer, depositors, expositor, geographer, idolaters, philosopher, photographer, thermometer
4 Syllables: UUSU
kilometres

Found 24 words across 5 groupings. Skipped 14 excess words of a similar stem.