acceleration vs natural philosophy

acceleration and natural philosophy both are nouns.

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

acceleration (noun)	natural philosophy (noun)
the act of accelerating; increasing the speed	the science of matter and energy and their interactions
an increase in rate of change
(physics) a rate of increase of velocity