ethereal vs ether

ethereal is not a noun while ether is a noun.

Word	Noun	Adjective	Verb	Adverb
ethereal	No	Yes	No	No
ether	Yes	No	No	No

ethereal (noun)	ether (noun)
	a colorless volatile highly flammable liquid formerly used as an inhalation anesthetic
	a medium that was once supposed to fill all space and to support the propagation of electromagnetic waves
	any of a class of organic compounds that have two hydrocarbon groups linked by an oxygen atom
	the fifth and highest element after air and earth and fire and water; was believed to be the substance composing all heavenly bodies

ethereal (adjective)	ether (adjective)
of or containing or dissolved in ether
characterized by unusual lightness and delicacy
of heaven or the spirit
characterized by lightness and insubstantiality; as impalpable or intangible as air