stiffness vs gaucherie

stiffness and gaucherie both are nouns.

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

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

stiffness: the inelegance of someone stiff and unrelaxed (as by embarrassment)
gaucherie: the quality of being rustic or gauche

Other hyponyms of stiffness include woodenness, rusticity.

stiffness (noun)	gaucherie (noun)
the physical property of being inflexible and hard to bend	a socially awkward or tactless act
the property of moving with pain or difficulty	the quality of being rustic or gauche
the inelegance of someone stiff and unrelaxed (as by embarrassment)
excessive sternness
firm resoluteness in purpose or opinion or action