skimmer vs chapeau

skimmer and chapeau both are nouns.

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

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

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

Other hypernyms of skimmer include hat, lid.

skimmer (noun)	chapeau (noun)
gull-like seabird that flies along the surface of the water with an elongated lower mandible immersed to skim out food	headdress that protects the head from bad weather; has shaped crown and usually a brim
a stiff hat made of straw with a flat crown
a cooking utensil used to skim fat from the surface of liquids
a rapid superficial reader