poor vs pitiable

poor is a noun but pitiable is not a noun.

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

As adjectives, poor and pitiable are synonyms defined as:

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

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

poor (adjective)	pitiable (adjective)
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