Or search: niter, nitre, compound, chemistry, guncotton, saltpeter, saltpetre, nitrospan, nitrostat, nitrocotton, nitroglycerin, nitroglycerine, trinitroglycerin
2 Syllables: SU
fireplace, hydrate, migrate, nitrate, primate, vibrate, violate
3 Syllables: USU
annihilate
4 Syllables: UUSU
carbohydrate

Found 9 words across 3 groupings. Skipped 4 excess words of a similar stem.