subprogram vs procedure

subprogram and procedure both are nouns.

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

As nouns, subprogram and procedure are synonyms defined as:

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

Other synonyms of subprogram include function, routine, subroutine.

subprogram (noun)	procedure (noun)
a set sequence of steps, part of larger computer program	a particular course of action intended to achieve a result
	a mode of conducting legal and parliamentary proceedings
	a process or series of acts especially of a practical or mechanical nature involved in a particular form of work
	a set sequence of steps, part of larger computer program