conjugation vs service

conjugation and service both are nouns.

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

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

conjugation (noun)	service (noun)
the act of pairing a male and female for reproductive purposes	an act of help or assistance; something (such as a tool, software or system) used to render said help or assistance
the act of making or becoming a single unit	the act of public worship following prescribed rules
a class of verbs having the same inflectional forms	(sports) a stroke that puts the ball in play
the complete set of inflected forms of a verb	the act of mating by male animals
the inflection of verbs	the act of delivering a writ or summons upon someone
the state of being joined together	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