mast vs jiggermast

mast and jiggermast both are nouns.

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

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

mast: a vertical spar for supporting sails
jiggermast: any small mast on a sailing vessel; especially the mizzenmast of a yawl

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

mast (noun)	jiggermast (noun)
a vertical spar for supporting sails	any small mast on a sailing vessel; especially the mizzenmast of a yawl
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