Underscoring rhymes with:
outscoring, scoring, kohring, outscoring, scoring, adoring, boring, deploring, doehring, doring, exploring, flooring, goehring, goring, ignoring, imploring, kohring, loring, moehring, mohring, moring, outpouring, outscoring, poring, pouring, restoring, roaring, scoring, shoring, snoring, soaring, storing, warring