naturalist vs philosopher

naturalist and philosopher both are nouns.

Word	Noun	Adjective	Verb	Adverb
naturalist	Yes	No	No	No
philosopher	Yes	No	No	No

As nouns, philosopher is a hypernym of naturalist; that is, philosopher is a word with a broader meaning than naturalist:

naturalist: an advocate of the doctrine that the world can be understood in scientific terms
philosopher: a specialist in philosophy

naturalist (noun)	philosopher (noun)
a biologist knowledgeable about natural history (especially botany and zoology)	a specialist in philosophy
an advocate of the doctrine that the world can be understood in scientific terms	a wise person who is calm and rational; someone who lives a life of reason with equanimity