peahen vs bird of Juno

peahen and bird of Juno both are nouns.

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

As nouns, bird of Juno is a hypernym of peahen; that is, bird of Juno is a word with a broader meaning than peahen:

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

Other hypernyms of peahen include peafowl.

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