Arctic char vs char

Arctic char and char both are nouns.

Word	Noun	Adjective	Verb	Adverb
Arctic char	Yes	No	No	No
char	Yes	No	Yes	No

As nouns, char is a hypernym of Arctic char; that is, char is a word with a broader meaning than Arctic char:

Arctic char: small trout of northern waters; landlocked populations in Quebec and northern New England
char: any of several small trout-like fish of the genus Salvelinus

Other hypernyms of Arctic char include charr.

Arctic char (noun)	char (noun)
small trout of northern waters; landlocked populations in Quebec and northern New England	any of several small trout-like fish of the genus Salvelinus
	a human female employed to do housework
	a charred substance

Arctic char (verb)	char (verb)
	burn slightly and superficially so as to affect color
	burn to charcoal