viscidness vs viscidity

viscidness and viscidity both are nouns.

Word	Noun	Adjective	Verb	Adverb
viscidness	Yes	No	No	No
viscidity	Yes	No	No	No

As nouns, viscidness and viscidity are synonyms defined as:

Other synonyms of viscidness include cohesiveness, glueyness, gluiness, gumminess, ropiness, tackiness.

viscidness (noun)	viscidity (noun)
the property of being cohesive and sticky	the property of being cohesive and sticky