magpie vs Pica pica

magpie and Pica pica both are nouns.

Word	Noun	Adjective	Verb	Adverb
magpie	Yes	No	No	No
Pica pica	Yes	No	No	No

As nouns, Pica pica is a hyponym of magpie; that is, Pica pica is a word with a more specific, narrower meaning than magpie:

magpie: long-tailed black-and-white crow that utters a raucous chattering call
Pica pica: a common magpie of Eurasia

Other hyponyms of magpie include European magpie, American magpie, Pica pica hudsonia.

magpie (noun)	Pica pica (noun)
long-tailed black-and-white crow that utters a raucous chattering call	a common magpie of Eurasia
someone who collects things that have been discarded by others
an obnoxious and foolish and loquacious talker