sail vs boat

sail and boat both are nouns.

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

As verbs, boat is a hypernym of sail; that is, boat is a word with a broader meaning than sail:

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

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