petchary vs Tyrannus tyrannus

petchary and Tyrannus tyrannus both are nouns.

Word	Noun	Adjective	Verb	Adverb
petchary	Yes	No	No	No
Tyrannus tyrannus	Yes	No	No	No

As nouns, Tyrannus tyrannus is a hypernym of petchary; that is, Tyrannus tyrannus is a word with a broader meaning than petchary:

petchary: a kingbird that breeds in the southeastern United States and winters in tropical America; similar to but larger than the eastern kingbird
Tyrannus tyrannus: large American flycatcher

Other hypernyms of petchary include kingbird.

petchary (noun)	Tyrannus tyrannus (noun)
a kingbird that breeds in the southeastern United States and winters in tropical America; similar to but larger than the eastern kingbird	large American flycatcher