work on vs mold

work on is not a noun while mold is a noun.

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

work on (noun)	mold (noun)
	container into which liquid is poured to create a given shape when it hardens
	sculpture produced by molding
	a distinctive nature, character, or type
	a dish or dessert that is formed in or on a mold
	a fungus that produces a superficial growth on various kinds of damp or decaying organic matter
	the process of becoming mildewed
	the distinctive form in which a thing is made
	loose soil rich in organic matter

work on (verb)	mold (verb)
shape, form, or improve a material	become moldy; spoil due to humidity
to exert effort in order to do, make, or perform something	shape or influence; give direction to
	fit tightly, follow the contours of
	form by pouring (e.g., wax or hot metal) into a cast or mold
	make something, usually for a specific function
	form in clay, wax, etc