mattock vs pickax

mattock and pickax both are nouns.

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

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

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

Other hypernyms of mattock include pick, pickaxe.

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