intensity vs intensify

intensity is a noun but intensify is not a noun.

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

intensity (noun)	intensify (noun)
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)

intensity (verb)	intensify (verb)
	become more intense
	make more intense, stronger, or more marked
	increase in extent or intensity
	make the chemically affected part of (a negative) denser or more opaque in order produce a stronger contrast between light and dark