routine vs subprogram

routine and subprogram both are nouns.

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

As nouns, routine and subprogram are synonyms defined as:

routine and subprogram: a set sequence of steps, part of larger computer program

Other synonyms of routine include function, procedure, subroutine.

routine (noun)	subprogram (noun)
an unvarying or habitual method or procedure	a set sequence of steps, part of larger computer program
a set sequence of steps, part of larger computer program
a short performance that is part of a longer program

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