browntail vs lymantriid

browntail and lymantriid both are nouns.

Word	Noun	Adjective	Verb	Adverb
browntail	Yes	No	No	No
lymantriid	Yes	No	No	No

As nouns, lymantriid is a hypernym of browntail; that is, lymantriid is a word with a broader meaning than browntail:

browntail: small brown and white European moth introduced into eastern United States; pest of various shade and fruit trees
lymantriid: dull-colored moth whose larvae have tufts of hair on the body and feed on the leaves of many deciduous trees

Other hypernyms of browntail include tussock moth.

browntail (noun)	lymantriid (noun)
small brown and white European moth introduced into eastern United States; pest of various shade and fruit trees	dull-colored moth whose larvae have tufts of hair on the body and feed on the leaves of many deciduous trees