sunniness vs cheerfulness

sunniness and cheerfulness both are nouns.

Word	Noun	Adjective	Verb	Adverb
sunniness	Yes	No	No	No
cheerfulness	Yes	No	No	No

As nouns, sunniness and cheerfulness are synonyms defined as:

sunniness and cheerfulness: the quality of being cheerful and dispelling gloom

Other synonyms of sunniness include cheer, sunshine.

sunniness (noun)	cheerfulness (noun)
lightness created by sunlight	the quality of being cheerful and dispelling gloom
the quality of being cheerful and dispelling gloom	a feeling of spontaneous good spirits