Underwritings rhymes with:
beatings, broadcasting's, castings, coatings, cuttings, everlastings, fighting's, fightings, fittings, footings, frostings, gettings, gittings, greetings, hastings, hustings, keating's, lanting's, lighting's, listings, marketing's, marketings, meeting's, meetings, outings, paintings, plantings, postings, printing's, printings, ratings, seatings, settings, shootings, sightings, tastings, weightings, whitings, writings, yachting's