daggerboard vs centreboard

daggerboard and centreboard both are nouns.

Word	Noun	Adjective	Verb	Adverb
daggerboard	Yes	No	No	No
centreboard	Yes	No	No	No

As nouns, centreboard is a hypernym of daggerboard; that is, centreboard is a word with a broader meaning than daggerboard:

daggerboard: a removable centerboard on a small sailboat that can be lowered into the water to serve as a keel
centreboard: a retractable fin keel used on sailboats to prevent drifting to leeward

Other hypernyms of daggerboard include centerboard, drop keel, sliding keel.

daggerboard (noun)	centreboard (noun)
a removable centerboard on a small sailboat that can be lowered into the water to serve as a keel	a retractable fin keel used on sailboats to prevent drifting to leeward