scissors vs pair of scissors

scissors and pair of scissors both are nouns.

Word	Noun	Adjective	Verb	Adverb
scissors	Yes	No	No	No
pair of scissors	Yes	No	No	No

As nouns, scissors and pair of scissors are synonyms defined as:

scissors and pair of scissors: an edge tool having two crossed pivoting blades

scissors (noun)	pair of scissors (noun)
a wrestling hold in which you wrap your legs around the opponents body or head and put your feet together and squeeze	an edge tool having two crossed pivoting blades
a gymnastic exercise performed on the pommel horse when the gymnast moves his legs as the blades of scissors move
an edge tool having two crossed pivoting blades