inclemency vs stiffness

inclemency and stiffness both are nouns.

Word	Noun	Adjective	Verb	Adverb
inclemency	Yes	No	No	No
stiffness	Yes	No	No	No

As nouns, inclemency and stiffness are synonyms defined as:

Other synonyms of inclemency include hardness, harshness, rigor, rigorousness, rigour, rigourousness, severeness, severity.

inclemency (noun)	stiffness (noun)
excessive sternness	the physical property of being inflexible and hard to bend
weather unsuitable for outdoor activities	the property of moving with pain or difficulty
	the inelegance of someone stiff and unrelaxed (as by embarrassment)
	excessive sternness
	firm resoluteness in purpose or opinion or action