intensify vs heat up

intensify and heat up both are verbs.

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

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

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

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