shape vs work on

shape is a noun but work on is not a noun.

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

shape (noun)	work on (noun)
the spatial arrangement of something as distinct from its substance
any spatial attributes (especially as defined by outline)
the visual appearance of something or someone
alternative names for the body of a human being
a perceptual structure
a concrete representation of an otherwise nebulous concept
the state of (good) health (especially in the phrases `in condition' or `in shape' or `out of condition' or `out of shape')

shape (verb)	work on (verb)
give shape or form to	shape, form, or improve a material
shape or influence; give direction to	to exert effort in order to do, make, or perform something
make something, usually for a specific function