work on vs coldwork

work on and coldwork both are verbs.

Word	Noun	Adjective	Verb	Adverb
work on	No	No	Yes	No
coldwork	No	No	Yes	No

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

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

work on (verb)	coldwork (verb)
shape, form, or improve a material	shape (metal) without heat
to exert effort in order to do, make, or perform something