owlet vs hooter

owlet and hooter both are nouns.

Word	Noun	Adjective	Verb	Adverb
owlet	Yes	No	No	No
hooter	Yes	No	No	No

As nouns, hooter is a hypernym of owlet; that is, hooter is a word with a broader meaning than owlet:

owlet: young owl
hooter: nocturnal bird of prey with hawk-like beak and claws and large head with front-facing eyes

Other hypernyms of owlet include bird of Minerva, bird of night, owl.

owlet (noun)	hooter (noun)
young owl	nocturnal bird of prey with hawk-like beak and claws and large head with front-facing eyes
	a device on an automobile for making a warning noise
	informal terms for the nose