Synonyms and related words :
airiness, airy nothing, bodilessness, ethereality, fineness, flimsiness, ghostliness, immateriality, immaterialness, impalpability, imponderability, incorporeity, inextension, insolidity, insubstantiality, intangibility, mistiness, nonexteriority, occult phenomena, occultism, otherworldliness, psychical research, psychicism, psychics, psychism, rareness, rarity, shadowiness, slightness, spirit world, spirituality, spirituousness, subtility, subtilty, subtlety, supernaturalism, tenuity, tenuousness, the occult, thinness, unconcreteness, unearthliness, unreality, unsolidity, unsubstantiality, unsubstantialness, unworldliness, vagueness