utility routine vs subroutine

utility routine and subroutine both are nouns.

Word	Noun	Adjective	Verb	Adverb
utility routine	Yes	No	No	No
subroutine	Yes	No	No	No

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

Other hypernyms of utility routine include function, procedure, routine, subprogram.

utility routine (noun)	subroutine (noun)
a routine that can be used as needed	a set sequence of steps, part of larger computer program