Showing results for "threshold" instead. (You can only search for 1 word at a time unless you use the Storm or Mosaic Rhyme tools)
Or search: sill, brink, verge, limen, casing, offset, doorway, kickoff, boundary, doorsill, doorstep, esthesis, sensation, aesthesis, commencement
2 Syllables: SU
fresco, frescoes, petrol, thresholds
3 Syllables: USU
Francesco
4 Syllables: UUSU
manifesto

Found 6 words across 3 groupings.