intensify vs hot up

intensify and hot up both are verbs.

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

As verbs, hot up is a hyponym of intensify; that is, hot up is a word with a more specific, narrower meaning than intensify:

Other hyponyms of intensify include heat up, screw up, fan, enhance, heighten, raise, amplify, sharpen, heighten, sharpen.

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