stiffening vs procedure

stiffening and procedure both are nouns.

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

As nouns, procedure is a hypernym of stiffening; that is, procedure is a word with a broader meaning than stiffening:

Other hypernyms of stiffening include process.

stiffening (noun)	procedure (noun)
the act of becoming stiff	a particular course of action intended to achieve a result
the process of becoming stiff or rigid	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