work vs upset

work and upset both are nouns.

Word	Noun	Adjective	Verb	Adverb
work	Yes	No	Yes	No
upset	Yes	Yes	Yes	No

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

work (noun)	upset (noun)
activity directed toward making or doing something	an improbable and unexpected victory
the occupation for which you are paid	the act of disturbing the mind or body
a product produced or accomplished through the effort or activity or agency of a person or thing	the act of upsetting something
a place where work is done	a tool used to thicken or spread metal (the end of a bar or a rivet etc.) by forging or hammering or swaging
the total output of a writer or artist (or a substantial part of it)	an unhappy and worried mental state
applying the mind to learning and understanding a subject (especially by reading)	a physical condition in which there is a disturbance of normal functioning
(physics) a manifestation of energy; the transfer of energy from one physical system to another expressed as the product of a force and the distance through which it moves a body in the direction of that force

work (adjective)	upset (adjective)
	thrown into a state of disarray or confusion
	mildly physically distressed
	afflicted with or marked by anxious uneasiness or trouble or grief
	having been turned so that the bottom is no longer the bottom
	used of an unexpected defeat of a team favored to win

work (verb)	upset (verb)
give a workout to	disturb the balance or stability of
arrive at a certain condition through repeated motion	defeat suddenly and unexpectedly
go sour or spoil	form metals with a swage
cause to undergo fermentation	move deeply
find the solution to (a problem or question) or understand the meaning of	cause to lose one's composure
use or manipulate to one's advantage	cause to overturn from an upright or normal position
to mix into a homogeneous mass
perform as expected when applied
move into or onto
shape, form, or improve a material
cause to happen or to occur as a consequence
prepare for crops
make something, usually for a specific function
gratify and charm, usually in order to influence
proceed along a path
move in an agitated manner
provoke or excite
be employed
cause to work
exert oneself by doing mental or physical work for a purpose or out of necessity; work
have an effect or outcome; often the one desired or expected
operate in a certain place, area, or specialty
proceed towards a goal or along a path or through an activity
have and exert influence or effect
operate in or through
cause to operate or function
behave in a certain way when handled