benefit vs do good

benefit is a noun but do good is not a noun.

Word	Noun	Adjective	Verb	Adverb
benefit	Yes	No	Yes	No
do good	No	No	Yes	No

As verbs, benefit and do good are synonyms defined as:

benefit (noun)	do good (noun)
something that aids or promotes well-being
a performance to raise money for a charitable cause
financial assistance in time of need

benefit (verb)	do good (verb)
derive a benefit from	be beneficial for
be beneficial for