pair of scissors vs scissors

pair of scissors and scissors both are nouns.

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

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

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

pair of scissors (noun)	scissors (noun)
an edge tool having two crossed pivoting blades	a wrestling hold in which you wrap your legs around the opponents body or head and put your feet together and squeeze
	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