GRAMMATICAL CATEGORY OF FEATHERLESS
Featherless is an adjective. The adjective is the word that accompanies the noun to determine or qualify it.
Is featherless a word?
Without feathers; unfledged.
Is feather a noun verb or adjective?
As detailed above, 'feather' can be a noun or a verb. Verb usage: The stylist feathered my hair. Verb usage: After striking the bird, the pilot feathered the left, damaged engine's propeller.