Prepay rhymes with:
repay, repay, banpais, dupay, pay, paye, pei, repay, spey, stupay, toupee, underpay, wah-pei
Prepay sounds like:
paperboy, prab, prebe, prefab, prep, preppie, preppy, preview, prevo, priebe, privy, prob, proba, probe, prof., proof, prop, propp, prove, provo, purifoy, purify, purpa, purvey, purview