mizzen vs mizzenmast

mizzen and mizzenmast both are nouns.

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

As nouns, mizzen and mizzenmast are synonyms defined as:

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

Other synonyms of mizzen include mizen, mizenmast.

mizzen (noun)	mizzenmast (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	third mast from the bow in a vessel having three or more masts; the after and shorter mast of a yawl, ketch, or dandy
fore-and-aft sail set on the mizzenmast