pair of scissors vs edge tool

pair of scissors and edge tool both are nouns.

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

As nouns, edge tool is a hypernym of pair of scissors; that is, edge tool is a word with a broader meaning than pair of scissors:

pair of scissors: an edge tool having two crossed pivoting blades
edge tool: any cutting tool with a sharp cutting edge (as a chisel or knife or plane or gouge)

Other hypernyms of pair of scissors include compound lever.

pair of scissors (noun)	edge tool (noun)
an edge tool having two crossed pivoting blades	any cutting tool with a sharp cutting edge (as a chisel or knife or plane or gouge)