mast vs jigger

mast and jigger both are nouns.

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

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

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

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

mast (noun)	jigger (noun)
a vertical spar for supporting sails	larval mite that sucks the blood of vertebrates including human beings causing intense irritation
any sturdy upright pole	a small glass adequate to hold a single swallow of whiskey
nuts of forest trees used as feed for swine	any small mast on a sailing vessel; especially the mizzenmast of a yawl
nuts of forest trees (as beechnuts and acorns) accumulated on the ground