pitiful vs poor

pitiful is not a noun while poor is a noun.

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

As adjectives, pitiful and poor are synonyms defined as:

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

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

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