cheer vs cheerfulness

cheer and cheerfulness both are nouns.

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

As nouns, cheer and cheerfulness are synonyms defined as:

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

Other synonyms of cheer include sunniness, sunshine.

cheer (noun)	cheerfulness (noun)
the quality of being cheerful and dispelling gloom	the quality of being cheerful and dispelling gloom
a cry or shout of approval	a feeling of spontaneous good spirits

cheer (verb)	cheerfulness (verb)
become cheerful
spur on or encourage especially by cheers and shouts
show approval or good wishes by shouting
cause (somebody) to feel happier or more cheerful
give encouragement to