dander vs scurf

dander and scurf both are nouns.

Word	Noun	Adjective	Verb	Adverb
dander	Yes	No	No	No
scurf	Yes	No	No	No

As nouns, scurf is a hypernym of dander; that is, scurf is a word with a broader meaning than dander:

dander: small scales from animal skins or hair or bird feathers that can cause allergic reactions in some people
scurf: a thin flake of dead epidermis shed from the surface of the skin

Other hypernyms of dander include exfoliation, scale.

dander (noun)	scurf (noun)
a feeling of anger and animosity	(botany) a covering that resembles scales or bran that covers some plant parts
small scales from animal skins or hair or bird feathers that can cause allergic reactions in some people	a thin flake of dead epidermis shed from the surface of the skin