scissors vs shears

scissors and shears both are nouns.

Word	Noun	Adjective	Verb	Adverb
scissors	Yes	No	No	No
shears	Yes	No	No	No

As nouns, shears is a hyponym of scissors; that is, shears is a word with a more specific, narrower meaning than scissors:

Other hyponyms of scissors include clipper, snuffers.

scissors (noun)	shears (noun)
a wrestling hold in which you wrap your legs around the opponents body or head and put your feet together and squeeze	large scissors with strong 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