compound vs hot up

compound is a noun but hot up is not a noun.

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

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

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

compound (noun)	hot up (noun)
an enclosure of residences and other building (especially in the Orient)
a whole formed by a union of two or more elements or parts
a word (as anthropology, kilocycle, builder) consisting of any of various combinations of words, combining forms, or affixes.
(chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight

compound (adjective)	hot up (adjective)
composed of more than one part
consisting of two or more substances or ingredients or elements or parts
composed of many distinct individuals united to form a whole or colony

compound (verb)	hot up (verb)
put or add together	make more powerful
make more intense, stronger, or more marked	make more intense
combine so as to form a whole; mix	gain heat or get hot
create by mixing or combining
calculate principal and interest