philanthropist vs altruist

philanthropist and altruist both are nouns.

Word	Noun	Adjective	Verb	Adverb
philanthropist	Yes	No	No	No
altruist	Yes	No	No	No

As nouns, philanthropist and altruist are synonyms defined as:

philanthropist and altruist: someone who makes charitable donations intended to increase human well-being

philanthropist (noun)	altruist (noun)
someone who makes charitable donations intended to increase human well-being	someone who makes charitable donations intended to increase human well-being