boat vs sail

boat and sail both are nouns.

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

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

Other hyponyms of boat include motorboat, yacht, row, canoe, kayak, paddle.

boat (noun)	sail (noun)
a small vessel for travel on water	an ocean trip taken for pleasure
a dish (often boat-shaped) for serving gravy or sauce	a large piece of fabric (usually canvas fabric) by means of which wind is used to propel a sailing vessel
	any structure that resembles a sail

boat (verb)	sail (verb)
ride in a boat on water	travel on water propelled by wind
	move with sweeping, effortless, gliding motions
	travel on water propelled by wind or by other means
	traverse or travel on (a body of water)