service routine vs routine

service routine and routine both are nouns.

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

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

Other hypernyms of service routine include function, procedure, subprogram, subroutine.

service routine (noun)	routine (noun)
a routine that can be used as needed	an unvarying or habitual method or procedure
	a set sequence of steps, part of larger computer program
	a short performance that is part of a longer program

service routine (adjective)	routine (adjective)
	found in the ordinary course of events