executive routine vs subprogram

executive routine and subprogram both are nouns.

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

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

Other hypernyms of executive routine include function, procedure, routine, subroutine.

executive routine (noun)	subprogram (noun)
a routine that coordinates the operation of subroutines	a set sequence of steps, part of larger computer program