Prepaying rhymes with:
repaying, repaying, nonpaying, paying, repaying, allaying, arraying, baying, betraying, buffeting, conveying, crocheting, decaying, delaying, dismaying, disobeying, displaying, doomsaying, fraying, graying, greying, haying, heying, laying, nonpaying, obeying, overplaying, paying, playing, portraying, praying, preying, purveying, repaying, replaying, saying, slaying, spraying, staying, straying, surveying, swaying, weighing
Prepaying sounds like:
parfums, perfumes, perfuming, peruvians, pervomaiskaya, prepping, previewing, probing, proofing, propionic, propping, provance, provenance, provence, provencio, provenience, provenza, province, province's, provinces, proving, purifying, purveying, purviance