bulldog ant vs emmet

bulldog ant and emmet both are nouns.

Word	Noun	Adjective	Verb	Adverb
bulldog ant	Yes	No	No	No
emmet	Yes	No	No	No

As nouns, emmet is a hypernym of bulldog ant; that is, emmet is a word with a broader meaning than bulldog ant:

bulldog ant: any of the large fierce Australian ants of the genus Myrmecia
emmet: social insect living in organized colonies; characteristically the males and fertile queen have wings during breeding season; wingless sterile females are the workers

Other hypernyms of bulldog ant include ant, pismire.

bulldog ant (noun)	emmet (noun)
any of the large fierce Australian ants of the genus Myrmecia	social insect living in organized colonies; characteristically the males and fertile queen have wings during breeding season; wingless sterile females are the workers