viscous vs pasty

viscous is not a noun while pasty is a noun.

Word	Noun	Adjective	Verb	Adverb
viscous	No	Yes	No	No
pasty	Yes	Yes	No	No

As adjectives, viscous and pasty are synonyms defined as:

Other synonyms of viscous include gluey, glutinous, gummy, mucilaginous, sticky, viscid.

viscous (noun)	pasty (noun)
	small meat pie or turnover
	(usually used in the plural) one of a pair of adhesive patches worn to cover the nipples of exotic dancers and striptease performers

viscous (adjective)	pasty (adjective)
having the sticky properties of an adhesive	having the sticky properties of an adhesive
having a relatively high resistance to flow	resembling paste in color; pallid