pencil vs rubber eraser

pencil and rubber eraser both are nouns.

Word	Noun	Adjective	Verb	Adverb
pencil	Yes	No	Yes	No
rubber eraser	Yes	No	No	No

pencil (noun)	rubber eraser (noun)
a thin cylindrical pointed writing implement; a rod of marking substance encased in wood	an eraser made of rubber (or of a synthetic material with properties similar to rubber); commonly mounted at one end of a pencil
a cosmetic in a long thin stick; designed to be applied to a particular part of the face
a figure formed by a set of straight lines or light rays meeting at a point
graphite (or a similar substance) used in such a way as to be a medium of communication

pencil (verb)	rubber eraser (verb)
write, draw, or trace with a pencil