mitt vs fist

mitt and fist both are nouns.

Word	Noun	Adjective	Verb	Adverb
mitt	Yes	No	No	No
fist	Yes	No	No	No

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

Other hyponyms of mitt include clenched fist, hooks, maulers, meat hooks, right, right hand, left, left hand.

mitt (noun)	fist (noun)
the handwear used by fielders in playing baseball	a hand with the fingers clenched in the palm (as for hitting)
the (prehensile) extremity of the superior limb