emperor vs nymphalid butterfly

emperor and nymphalid butterfly both are nouns.

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

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

emperor: large richly colored butterfly
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 emperor include brush-footed butterfly, four-footed butterfly, nymphalid.

emperor (noun)	nymphalid butterfly (noun)
large richly colored butterfly	medium to large butterflies found worldwide typically having brightly colored wings and much-reduced nonfunctional forelegs carried folded on the breast
large moth of temperate forests of Eurasia having heavily scaled transparent wings
red table grape of California
the male ruler of an empire