poor vs pitiful

poor is a noun but pitiful is not a noun.

Word	Noun	Adjective	Verb	Adverb
poor	Yes	Yes	No	No
pitiful	No	Yes	No	No

As adjectives, poor and pitiful are synonyms defined as:

Other synonyms of poor include hapless, miserable, misfortunate, pathetic, piteous, pitiable, wretched.

poor (noun)	pitiful (noun)
people without possessions or wealth (considered as a group)

poor (adjective)	pitiful (adjective)
having little money or few possessions	bad; unfortunate
lacking in quality or substances	inspiring mixed contempt and pity
characterized by or indicating poverty	deserving or inciting pity
of insufficient quantity to meet a need
deserving or inciting pity