Or search: toil, grind, drudgery, plodding
1 Syllable: S
2 Syllables: SU
3 Syllables: USU
3 Syllables: UUS
4 Syllables: UUSU
Ebenezer, kilometres, misdemeanor, unbeliever

Found 91 words across 5 groupings. Skipped 50 excess words of a similar stem.