gawkiness vs clumsiness

gawkiness and clumsiness both are nouns.

Word	Noun	Adjective	Verb	Adverb
gawkiness	Yes	No	No	No
clumsiness	Yes	No	No	No

As nouns, clumsiness is a hypernym of gawkiness; that is, clumsiness is a word with a broader meaning than gawkiness:

gawkiness: the carriage of someone whose movements and posture are extremely ungainly and inelegant
clumsiness: the carriage of someone whose movements and posture are ungainly or inelegant

Other hypernyms of gawkiness include awkwardness.

gawkiness (noun)	clumsiness (noun)
the carriage of someone whose movements and posture are extremely ungainly and inelegant	the carriage of someone whose movements and posture are ungainly or inelegant
	the inelegance of someone stiff and unrelaxed (as by embarrassment)
	unskillfulness resulting from a lack of training