brush turkey vs scrub fowl

brush turkey and scrub fowl both are nouns.

Word	Noun	Adjective	Verb	Adverb
brush turkey	Yes	No	No	No
scrub fowl	Yes	No	No	No

As nouns, scrub fowl is a hypernym of brush turkey; that is, scrub fowl is a word with a broader meaning than brush turkey:

brush turkey: black megapode of wooded regions of Australia and New Guinea
scrub fowl: large-footed short-winged birds of Australasia; build mounds of decaying vegetation to incubate eggs

Other hypernyms of brush turkey include megapode, mound-bird, mound bird, mound builder.

brush turkey (noun)	scrub fowl (noun)
black megapode of wooded regions of Australia and New Guinea	large-footed short-winged birds of Australasia; build mounds of decaying vegetation to incubate eggs