kingbird vs tyrant flycatcher

kingbird and tyrant flycatcher both are nouns.

Word	Noun	Adjective	Verb	Adverb
kingbird	Yes	No	No	No
tyrant flycatcher	Yes	No	No	No

As nouns, tyrant flycatcher is a hypernym of kingbird; that is, tyrant flycatcher is a word with a broader meaning than kingbird:

kingbird: large American flycatcher
tyrant flycatcher: large American birds that characteristically catch insects on the wing

Other hypernyms of kingbird include flycatcher, New World flycatcher, tyrant bird.

kingbird (noun)	tyrant flycatcher (noun)
large American flycatcher	large American birds that characteristically catch insects on the wing