pasty vs viscous

pasty is a noun but viscous is not a noun.

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

As adjectives, pasty and viscous are synonyms defined as:

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

pasty (noun)	viscous (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

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