Openness rhymes with:
drunkenness, evenness, humanness, suddenness, drunkenness, evenness, greenness, humanness, meanness, oneness, sternness, stubbornness, suddenness
Openness sounds like:
obeying, obnoxious, offense, offenses, offing, opening, openings, opens, openshaw, opines, opining, opinions, oppens, ovens, ovonic