procedure vs rigmarole

procedure and rigmarole both are nouns.

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

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

procedure (noun)	rigmarole (noun)
a particular course of action intended to achieve a result	a long and complicated and confusing procedure
a mode of conducting legal and parliamentary proceedings	a set of confused and meaningless statements
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