Unionized rhymes with:
nonunionized, nonunionized, nonunionized, immunized, nonunionized, africanized, agonized, aluminized, americanized, antagonized, balkanized, canonized, carbonized, christianized, colonized, demonized, disorganized, galvanized, harmonized, hellenized, homogenized, humanized, immunized, lionized, mechanized, nonunionized, organized, patronized, reorganized, revolutionized, scrutinized, synchronized, unorganized, urbanized
Unionized sounds like:
umscheid, umstead, unangst, unannounced, unassisted, unchecked, uncoat, uncoated, uncouth, unctad, uncut, unhinged, unionist, unissued, unjust, unmanaged, unmasked, unmixed, unquote, unsaid, unscathed, unseat, unseated, unset, unstated, unsteady, unsuited, unswayed, unused, unwashed