Similar word to seity:

air, character, complexion, difference, discreteness, disposition, dissimilarity, distinction, distinctiveness, eccentricity, habit, humor, identity, idiosyncrasy, independence, individualism, ipseity, makeup, manner, nature, oddity, oneness, originality, particularity, peculiarity, rarity, seity, selfdom, selfhood, selfness, separateness, singleness, singularity, singularness, temper, temperament, uniqueness, unity, unlikeness, way