pickaxe vs mattock

pickaxe and mattock both are nouns.

Word	Noun	Adjective	Verb	Adverb
pickaxe	Yes	No	No	No
mattock	Yes	No	No	No

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

pickaxe: a heavy iron tool with a wooden handle and a curved head that is pointed on both ends
mattock: a kind of pick that is used for digging; has a flat blade set at right angles to the handle

pickaxe (noun)	mattock (noun)
a heavy iron tool with a wooden handle and a curved head that is pointed on both ends	a kind of pick that is used for digging; has a flat blade set at right angles to the handle