procedure vs subroutine

procedure and subroutine both are nouns.

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

As nouns, procedure and subroutine are synonyms defined as:

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

Other synonyms of procedure include function, routine, subprogram.

procedure (noun)	subroutine (noun)
a particular course of action intended to achieve a result	a set sequence of steps, part of larger computer program
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