pickax vs mattock

pickax and mattock both are nouns.

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

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

pickax: 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

pickax (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