hob vs edge tool

hob and edge tool both are nouns.

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

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

hob: a hard steel edge tool used to cut gears
edge tool: any cutting tool with a sharp cutting edge (as a chisel or knife or plane or gouge)

hob (noun)	edge tool (noun)
a shelf beside an open fire where something can be kept warm	any cutting tool with a sharp cutting edge (as a chisel or knife or plane or gouge)
a hard steel edge tool used to cut gears
(folklore) a small grotesque supernatural creature that makes trouble for human beings
(folklore) fairies that are somewhat mischievous

hob (verb)	edge tool (verb)
cut with a hob