work vs exercise

work and exercise both are nouns.

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

As verbs, work and exercise are synonyms defined as:

Other synonyms of work include work out.

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

Other hyponyms of work include work, work out, computerise, computerize, cybernate, rack, exploit, overwork.

work (noun)	exercise (noun)
activity directed toward making or doing something	the activity of exerting your muscles in various ways to keep fit
the occupation for which you are paid	a task performed or problem solved in order to develop skill or understanding
a product produced or accomplished through the effort or activity or agency of a person or thing	systematic training by multiple repetitions
a place where work is done	the act of using
the total output of a writer or artist (or a substantial part of it)	an action, often used negatively and without consequences
applying the mind to learning and understanding a subject (especially by reading)	(usually plural) a ceremony that involves processions and speeches
(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 (verb)	exercise (verb)
give a workout to	do physical exercise
arrive at a certain condition through repeated motion	give a workout to
go sour or spoil	learn by repetition
cause to undergo fermentation	put to use
find the solution to (a problem or question) or understand the meaning of	carry out or practice; as of jobs and professions
use or manipulate to one's advantage
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