metric function vs natural philosophy

metric function and natural philosophy both are nouns.

Word	Noun	Adjective	Verb	Adverb
metric function	Yes	No	No	No
natural philosophy	Yes	No	No	No

metric function (noun)	natural philosophy (noun)
a function of a topological space that gives, for any two points in the space, a value equal to the distance between them	the science of matter and energy and their interactions