libertarian vs philosopher

libertarian and philosopher both are nouns.

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

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

libertarian (noun)	philosopher (noun)
someone who believes the doctrine of free will	a specialist in philosophy
an advocate of libertarianism	a wise person who is calm and rational; someone who lives a life of reason with equanimity