procedure vs routine

procedure and routine both are nouns.

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

As nouns, routine is a hyponym of procedure; that is, routine is a word with a more specific, narrower meaning than procedure:

As nouns, procedure and routine are synonyms defined as:

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

Other synonyms of procedure include function, subprogram, subroutine.

procedure (noun)	routine (noun)
a particular course of action intended to achieve a result	an unvarying or habitual method or procedure
a mode of conducting legal and parliamentary proceedings	a set sequence of steps, part of larger computer program
a process or series of acts especially of a practical or mechanical nature involved in a particular form of work	a short performance that is part of a longer program
a set sequence of steps, part of larger computer program

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