service vs help

service and help both are nouns.

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

As nouns, help is a hypernym of service; that is, help is a word with a broader meaning than service:

service: an act of help or assistance; something (such as a tool, software or system) used to render said help or assistance
help: the activity of contributing to the fulfillment of a need or furtherance of an effort or purpose

Other hypernyms of service include aid, assist, assistance.

As nouns, service and help are synonyms defined as:

Other synonyms of service include avail.

service (noun)	help (noun)
an act of help or assistance; something (such as a tool, software or system) used to render said help or assistance	the activity of contributing to the fulfillment of a need or furtherance of an effort or purpose
the act of public worship following prescribed rules	a person or thing that is a resource that helps make something easier or possible to do
(sports) a stroke that puts the ball in play	a means of serving
the act of mating by male animals	a person who contributes to the fulfillment of a need or furtherance of an effort or purpose
the act of delivering a writ or summons upon someone
periodic maintenance on a car or machine
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

service (verb)	help (verb)
make fit for use	improve the condition of
mate with	improve; change for the better
be used by; as of a utility	help to some food; help with food or drink
	take or use
	give help or assistance; be of service
	contribute to the furtherance of
	be of use
	abstain from doing; always used with a negative