boat vs cutter

boat and cutter both are nouns.

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

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

boat (noun)	cutter (noun)
a small vessel for travel on water	a cutting implement; a tool for cutting
a dish (often boat-shaped) for serving gravy or sauce	a boat for communication between ship and shore
	a sailing vessel with a single mast set further back than the mast of a sloop
	someone whose work is cutting (as e.g. cutting cloth for garments)
	someone who carves the meat
	someone who cuts or carves stone

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