inclemency vs harshness

inclemency and harshness both are nouns.

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

As nouns, inclemency and harshness are synonyms defined as:

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

inclemency (noun)	harshness (noun)
excessive sternness	the quality of being harsh or rough or grating to the senses
weather unsuitable for outdoor activities	excessive sternness
	the roughness of a substance that causes abrasions
	the quality of being cruel and causing tension or annoyance