razorback vs backed

razorback is a noun but backed is not a noun.

Word	Noun	Adjective	Verb	Adverb
razorback	Yes	Yes	No	No
backed	No	Yes	No	No

razorback (noun)	backed (noun)
a mongrel hog with a thin body and long legs and a ridged back; a wild or semi-wild descendant of improved breeds; found chiefly in the southeastern United States
any of several baleen whales of the family Balaenopteridae having longitudinal grooves on the throat and a small pointed dorsal fin

razorback (adjective)	backed (adjective)
having a sharp narrow back	having a back or backing, usually of a specified type
	used of film that is coated on the side opposite the emulsion with a substance to absorb light