half-intensity vs intensity

half-intensity and intensity both are nouns.

Word	Noun	Adjective	Verb	Adverb
half-intensity	Yes	No	No	No
intensity	Yes	No	No	No

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

half-intensity: half the maximum intensity
intensity: the amount of energy transmitted (as by acoustic or electromagnetic radiation)

Other hypernyms of half-intensity include intensity level, strength.

half-intensity (noun)	intensity (noun)
half the maximum intensity	high level or degree; the property of being intense
	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)