bearskin vs chapeau

bearskin and chapeau both are nouns.

Word	Noun	Adjective	Verb	Adverb
bearskin	Yes	No	No	No
chapeau	Yes	No	No	No

As nouns, chapeau is a hypernym of bearskin; that is, chapeau is a word with a broader meaning than bearskin:

bearskin: tall hat; worn by some British soldiers on ceremonial occasions
chapeau: headdress that protects the head from bad weather; has shaped crown and usually a brim

Other hypernyms of bearskin include hat, lid.

bearskin (noun)	chapeau (noun)
tall hat; worn by some British soldiers on ceremonial occasions	headdress that protects the head from bad weather; has shaped crown and usually a brim
the pelt of a bear