peacock vs bird of Juno

peacock and bird of Juno both are nouns.

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

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

peacock: male peafowl; having a crested head and very large fanlike tail marked with iridescent eyes or spots
bird of Juno: very large terrestrial southeast Asian pheasant often raised as an ornamental bird

Other hypernyms of peacock include peafowl.

peacock (noun)	bird of Juno (noun)
male peafowl; having a crested head and very large fanlike tail marked with iridescent eyes or spots	very large terrestrial southeast Asian pheasant often raised as an ornamental bird
European butterfly having reddish-brown wings each marked with a purple eyespot