Underpaying rhymes with:
overpaying, overpaying, taxpaying, downplaying, outweighing, overpaying, relaying, ricocheting, roleplaying, taxpaying
Underpaying sounds like:
underfinance, underpinning, underpinnings
overpaying, overpaying, taxpaying, downplaying, outweighing, overpaying, relaying, ricocheting, roleplaying, taxpaying
underfinance, underpinning, underpinnings