hydrofoil vs speedboat

hydrofoil and speedboat both are nouns.

Word	Noun	Adjective	Verb	Adverb
hydrofoil	Yes	No	No	No
speedboat	Yes	No	No	No

As nouns, speedboat is a hypernym of hydrofoil; that is, speedboat is a word with a broader meaning than hydrofoil:

hydrofoil: a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds
speedboat: a fast motorboat

hydrofoil (noun)	speedboat (noun)
a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds	a fast motorboat
a device consisting of a flat or curved piece (as a metal plate) so that its surface reacts to the water it is passing through