mallee fowl vs scrub fowl

mallee fowl and scrub fowl both are nouns.

Word	Noun	Adjective	Verb	Adverb
mallee fowl	Yes	No	No	No
scrub fowl	Yes	No	No	No

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

mallee fowl: Australian mound bird; incubates eggs naturally in sandy mounds
scrub fowl: large-footed short-winged birds of Australasia; build mounds of decaying vegetation to incubate eggs

Other hypernyms of mallee fowl include megapode, mound-bird, mound bird, mound builder.

mallee fowl (noun)	scrub fowl (noun)
Australian mound bird; incubates eggs naturally in sandy mounds	large-footed short-winged birds of Australasia; build mounds of decaying vegetation to incubate eggs