headiness vs intensity

headiness and intensity both are nouns.

Word	Noun	Adjective	Verb	Adverb
headiness	Yes	No	No	No
intensity	Yes	No	No	No

As nouns, intensity is a hypernym of headiness; that is, intensity is a word with a broader meaning than headiness:

Other hypernyms of headiness include intensiveness.

headiness (noun)	intensity (noun)
The characteristic of being intoxicating or stupefying.	high level or degree; the property of being intense
The characteristic of being exhilarating, tending to upset the mind or senses.	chromatic purity: freedom from dilution with white and hence vivid in hue
	the magnitude of sound (usually in a specified direction)
	the amount of energy transmitted (as by acoustic or electromagnetic radiation)