legionary ant vs emmet

legionary ant and emmet both are nouns.

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

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

legionary ant: tropical nomadic ant that preys mainly on other insects
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 legionary ant include ant, pismire.

legionary ant (noun)	emmet (noun)
tropical nomadic ant that preys mainly on other insects	social insect living in organized colonies; characteristically the males and fertile queen have wings during breeding season; wingless sterile females are the workers