ungainliness vs clumsiness

ungainliness and clumsiness both are nouns.

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

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

ungainliness: 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 ungainliness include awkwardness.

ungainliness (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