trogon vs quetzal bird

trogon and quetzal bird both are nouns.

Word	Noun	Adjective	Verb	Adverb
trogon	Yes	No	No	No
quetzal bird	Yes	No	No	No

As nouns, quetzal bird is a hyponym of trogon; that is, quetzal bird is a word with a more specific, narrower meaning than trogon:

trogon: forest bird of warm regions of the New World having brilliant lustrous plumage and long tails
quetzal bird: large trogon of Central America and South America having golden-green and scarlet plumage

Other hyponyms of trogon include quetzal.

trogon (noun)	quetzal bird (noun)
forest bird of warm regions of the New World having brilliant lustrous plumage and long tails	large trogon of Central America and South America having golden-green and scarlet plumage