clumsiness vs gawkiness

clumsiness and gawkiness both are nouns.

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

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

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

Other hyponyms of clumsiness include gracelessness, ungracefulness, ungainliness, stiffness.

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