lightsomeness vs blitheness

lightsomeness and blitheness both are nouns.

Word	Noun	Adjective	Verb	Adverb
lightsomeness	Yes	No	No	No
blitheness	Yes	No	No	No

As nouns, blitheness is a hypernym of lightsomeness; that is, blitheness is a word with a broader meaning than lightsomeness:

Other hypernyms of lightsomeness include cheerfulness.

lightsomeness (noun)	blitheness (noun)
the trait of being lighthearted and frivolous	a feeling of spontaneous good spirits
the gracefulness of a person or animal that is quick and nimble
the cheerful feeling you have when nothing is troubling you