work vs service

work and service both are nouns.

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

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

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

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

Other hyponyms of work include double, roll, run, cut, serve.

work (noun)	service (noun)
activity directed toward making or doing something	an act of help or assistance; something (such as a tool, software or system) used to render said help or assistance
the occupation for which you are paid	the act of public worship following prescribed rules
a product produced or accomplished through the effort or activity or agency of a person or thing	(sports) a stroke that puts the ball in play
a place where work is done	the act of mating by male animals
the total output of a writer or artist (or a substantial part of it)	the act of delivering a writ or summons upon someone
applying the mind to learning and understanding a subject (especially by reading)	periodic maintenance on a car or machine
(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	the performance of duties by a waiter or servant
	employment in or work for another
	work done by one person or group that benefits another
	(law) the acts performed by an English feudal tenant for the benefit of his lord which formed the consideration for the property granted to him
	tableware consisting of a complete set of articles (silver or dishware) for use at table
	a means of serving
	a force that is a branch of the armed forces
	a company or agency that performs a public service; subject to government regulation

work (verb)	service (verb)
give a workout to	make fit for use
arrive at a certain condition through repeated motion	mate with
go sour or spoil	be used by; as of a utility
cause to undergo fermentation
find the solution to (a problem or question) or understand the meaning of
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