hot up vs intensify

hot up and intensify both are verbs.

Word	Noun	Adjective	Verb	Adverb
hot up	No	No	Yes	No
intensify	No	No	Yes	No

As verbs, intensify is a hypernym of hot up; that is, intensify is a word with a broader meaning than hot up:

Other hypernyms of hot up include compound, deepen, heighten.

hot up (verb)	intensify (verb)
make more powerful	become more intense
make more intense	make more intense, stronger, or more marked
gain heat or get hot	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