female mammal vs mammal

female mammal and mammal both are nouns.

Word	Noun	Adjective	Verb	Adverb
female mammal	Yes	No	No	No
mammal	Yes	No	No	No

As nouns, mammal is a hypernym of female mammal; that is, mammal is a word with a broader meaning than female mammal:

female mammal: animals that nourish their young with milk
mammal: any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk

Other hypernyms of female mammal include female, mammalian.

female mammal (noun)	mammal (noun)
animals that nourish their young with milk	any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk