work on vs hot-work

work on and hot-work both are verbs.

Word	Noun	Adjective	Verb	Adverb
work on	No	No	Yes	No
hot-work	No	No	Yes	No

As verbs, hot-work is a hyponym of work on; that is, hot-work is a word with a more specific, narrower meaning than work on:

Other hyponyms of work on include cold work, coldwork, overwork, make over, retread, rework, rack, tool, till.

work on (verb)	hot-work (verb)
shape, form, or improve a material	roll, press, forge, or shape (metal) while hot
to exert effort in order to do, make, or perform something