pickax vs edge tool

pickax and edge tool both are nouns.

Word	Noun	Adjective	Verb	Adverb
pickax	Yes	No	No	No
edge tool	Yes	No	No	No

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

pickax: a heavy iron tool with a wooden handle and a curved head that is pointed on both ends
edge tool: any cutting tool with a sharp cutting edge (as a chisel or knife or plane or gouge)

pickax (noun)	edge tool (noun)
a heavy iron tool with a wooden handle and a curved head that is pointed on both ends	any cutting tool with a sharp cutting edge (as a chisel or knife or plane or gouge)