bird of Juno vs peahen

bird of Juno and peahen both are nouns.

Word	Noun	Adjective	Verb	Adverb
bird of Juno	Yes	No	No	No
peahen	Yes	No	No	No

As nouns, peahen is a hyponym of bird of Juno; that is, peahen is a word with a more specific, narrower meaning than bird of Juno:

bird of Juno: very large terrestrial southeast Asian pheasant often raised as an ornamental bird
peahen: female peafowl

Other hyponyms of bird of Juno include pea-chick, peachick, peacock, blue peafowl, Pavo cristatus, green peafowl, Pavo muticus.

bird of Juno (noun)	peahen (noun)
very large terrestrial southeast Asian pheasant often raised as an ornamental bird	female peafowl