mizzen vs mast

mizzen and mast both are nouns.

Word	Noun	Adjective	Verb	Adverb
mizzen	Yes	No	No	No
mast	Yes	No	No	No

As nouns, mast is a hypernym of mizzen; that is, mast is a word with a broader meaning than mizzen:

mizzen: third mast from the bow in a vessel having three or more masts; the after and shorter mast of a yawl, ketch, or dandy
mast: a vertical spar for supporting sails

mizzen (noun)	mast (noun)
third mast from the bow in a vessel having three or more masts; the after and shorter mast of a yawl, ketch, or dandy	a vertical spar for supporting sails
fore-and-aft sail set on the mizzenmast	any sturdy upright pole
	nuts of forest trees used as feed for swine
	nuts of forest trees (as beechnuts and acorns) accumulated on the ground