natural philosophy vs pencil

natural philosophy and pencil both are nouns.

Word	Noun	Adjective	Verb	Adverb
natural philosophy	Yes	No	No	No
pencil	Yes	No	Yes	No

natural philosophy (noun)	pencil (noun)
the science of matter and energy and their interactions	a thin cylindrical pointed writing implement; a rod of marking substance encased in wood
	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

natural philosophy (verb)	pencil (verb)
	write, draw, or trace with a pencil