Competitiveness rhymes with:
destructiveness, destructiveness, inclusiveness, pervasiveness, cavness, destructiveness, inclusiveness, pervasiveness, agnes, alanis, banis, baroness, bennis, bodanis, burtness, business', cabaniss, cabiness, campanis, cavaness, caviness, cavness, chamness, chronis, cleanliness, cleanness, closeness, cloudiness, creepiness, cutesiness, dampness, debonis, demarinis, denis, dennis, denys, destefanis, destructiveness, diaphanous, donis, enis, ennis, forness, friendliness, frothiness, furness, galanis, ganis, ganus, genis, genuineness, glynis, glynnis, grannis, gurganus, hannis, hanus, henness, hennis, holness, hopefulness, hovhaness, hyannis, inclusiveness, indebtedness, ineptness, ines, iniss, inness, innis, inniss, irishness, janis, jealousness, jenness, kanis, kipnis, kiwanis, largeness, louganis, maginnis, maness, manis, mannis, manus, maraniss, marchioness, minnis, munis, penis, pernice, pervasiveness, rancorousness, rareness, ravinous, ravinus, rawness, rogness, sacredness, selflessness, sfernice, shortsightedness, simonis, smartness, solitariness, stanis, starkness, steadiness, stennis, stinginess, storminess, st_denis, st_dennis, sylvanus, tanis, thinness, thoughtfulness, tiredness, tunis, unconsciousness, unhappiness, unwillingness, vagueness, vannice, vernis, veronis, viciousness, wariness, wholeness, worthiness, younis, yunis