stiffness vs gracelessness

stiffness and gracelessness both are nouns.

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

As nouns, stiffness and gracelessness are synonyms defined as:

stiffness and gracelessness: the inelegance of someone stiff and unrelaxed (as by embarrassment)

Other synonyms of stiffness include awkwardness, clumsiness.

stiffness (noun)	gracelessness (noun)
the physical property of being inflexible and hard to bend	an unpleasant lack of grace in carriage or form or movement or expression
the property of moving with pain or difficulty	the inelegance of someone stiff and unrelaxed (as by embarrassment)
the inelegance of someone stiff and unrelaxed (as by embarrassment)
excessive sternness
firm resoluteness in purpose or opinion or action