boater vs lid

boater and lid both are nouns.

Word	Noun	Adjective	Verb	Adverb
boater	Yes	No	No	No
lid	Yes	No	No	No

As nouns, lid is a hypernym of boater; that is, lid is a word with a broader meaning than boater:

boater: a stiff hat made of straw with a flat crown
lid: headdress that protects the head from bad weather; has shaped crown and usually a brim

Other hypernyms of boater include chapeau, hat.

boater (noun)	lid (noun)
a stiff hat made of straw with a flat crown	a movable top or cover (hinged or separate) for closing the opening at the top of a box, chest, jar, pan, etc.
someone who drives or rides in a boat	headdress that protects the head from bad weather; has shaped crown and usually a brim
	either of two folds of skin that can be moved to cover or open the eye