Or search: urge, whim, pulse, thrust, caprice, impetus, pulsing, abience, adience, momentum, impulsion, pulsation, motivation, wanderlust, undulation
2 Syllables: SU
pulses, Ulrich
3 Syllables: SUU
hindrances, indices, instances, singleness
3 Syllables: USU
compulsive, convulsive, impulsive, indulges, repulsive
4 Syllables: USUU
diminutive

Found 12 words across 4 groupings.