boat vs ferryboat

boat and ferryboat both are nouns.

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

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

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

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

boat (verb)	ferryboat (verb)
ride in a boat on water