dryad vs nymph

dryad and nymph both are nouns.

Word	Noun	Adjective	Verb	Adverb
dryad	Yes	No	No	No
nymph	Yes	No	No	No

As nouns, nymph is a hypernym of dryad; that is, nymph is a word with a broader meaning than dryad:

dryad: a deity or nymph of the woods
nymph: (classical mythology) a minor nature goddess usually depicted as a beautiful maiden

dryad (noun)	nymph (noun)
a deity or nymph of the woods	a larva of an insect with incomplete metamorphosis (as the dragonfly or mayfly)
	(classical mythology) a minor nature goddess usually depicted as a beautiful maiden
	a voluptuously beautiful young woman