executive routine vs subroutine

executive routine and subroutine both are nouns.

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

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

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

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