heat of vaporization vs American spelling

heat of vaporization and American spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
heat of vaporization	Yes	No	No	No
American spelling	Yes	No	No	No

heat of vaporization (noun)	American spelling (noun)
heat absorbed by a unit mass of a material at its boiling point in order to convert the material into a gas at the same temperature	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')