mast vs foremast

mast and foremast both are nouns.

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

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

Other hyponyms of mast include jigger, jiggermast, jury mast, mainmast, mizen, mizenmast, mizzen, mizzenmast, topmast.

mast (noun)	foremast (noun)
a vertical spar for supporting sails	the mast nearest the bow in vessels with two or more masts
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