peacock vs nymphalid butterfly

peacock and nymphalid butterfly both are nouns.

Word	Noun	Adjective	Verb	Adverb
peacock	Yes	No	No	No
nymphalid butterfly	Yes	No	No	No

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

peacock: European butterfly having reddish-brown wings each marked with a purple eyespot
nymphalid butterfly: medium to large butterflies found worldwide typically having brightly colored wings and much-reduced nonfunctional forelegs carried folded on the breast

Other hypernyms of peacock include brush-footed butterfly, four-footed butterfly, nymphalid.

peacock (noun)	nymphalid butterfly (noun)
male peafowl; having a crested head and very large fanlike tail marked with iridescent eyes or spots	medium to large butterflies found worldwide typically having brightly colored wings and much-reduced nonfunctional forelegs carried folded on the breast
European butterfly having reddish-brown wings each marked with a purple eyespot