ruddiness vs rosiness

ruddiness and rosiness both are nouns.

Word	Noun	Adjective	Verb	Adverb
ruddiness	Yes	No	No	No
rosiness	Yes	No	No	No

As nouns, ruddiness and rosiness are synonyms defined as:

ruddiness (noun)	rosiness (noun)
a healthy reddish complexion	a healthy reddish complexion
	a dusty pink color
	a rosy color (especially in the cheeks) taken as a sign of good health