delivery vs service

delivery and service both are nouns.

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

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

delivery: the act of delivering or distributing something (as goods or mail)
service: the act of delivering a writ or summons upon someone

Other hyponyms of delivery include airdrop, consignment, handing over, passage, post, service of process, serving.

delivery (noun)	service (noun)
recovery or preservation from loss or danger	an act of help or assistance; something (such as a tool, software or system) used to render said help or assistance
the voluntary transfer of something (title or possession) from one party to another	the act of public worship following prescribed rules
the act of delivering a child	(sports) a stroke that puts the ball in play
the act of throwing a baseball or softball by the pitcher towards home plate, which initiates play by giving the batter a chance to hit it	the act of mating by male animals
the act of delivering or distributing something (as goods or mail)	the act of delivering a writ or summons upon someone
your characteristic style or manner of expressing yourself orally	periodic maintenance on a car or machine
the event of giving birth	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