boat vs ferry

boat and ferry both are nouns.

Word	Noun	Adjective	Verb	Adverb
boat	Yes	No	Yes	No
ferry	Yes	No	Yes	No

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

boat: a small vessel for travel on water
ferry: a boat that transports people or vehicles across a body of water and operates on a regular schedule

boat (noun)	ferry (noun)
a small vessel for travel on water	transport by boat or aircraft
a dish (often boat-shaped) for serving gravy or sauce	a boat that transports people or vehicles across a body of water and operates on a regular schedule

boat (verb)	ferry (verb)
ride in a boat on water	travel by ferry
	transport by ferry
	transport from one place to another