潤滑油 （ジュンカツユ） lubricating oil, lubricant, lube, person or thing that makes things run smoothly, facilitator

潤色 （ジュンショク） rhetorical flourishes

豊潤 （ホウジュン） abundant, rich, ripe, mellow

芳醇 （ホウジュン） mellow (flavor or fragrance, esp. alcohol), rich, full-bodied, superior

潤う （うるおう） to become moist, to be moistened, to become damp, to get wet, to profit (from), to benefit, to become prosperous, to flourish, to be made rich, to be refreshed (of one's mind), to be enriched (of one's heart)

潤す （うるおす） to moisten, to wet, to profit, to enrich, to benefit

潤む （うるむ） to be wet (with tears), to be moist, to get dim, to become blurred, to get cloudy, to get muddy, to be bleared, to become tear-choked