Pullman car vs Pullman

Pullman car and Pullman both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pullman car	Yes	No	No	No
Pullman	Yes	No	No	No

As nouns, Pullman car and Pullman are synonyms defined as:

Pullman car and Pullman: luxurious passenger car; for day or night travel

Pullman car (noun)	Pullman (noun)
luxurious passenger car; for day or night travel	luxurious passenger car; for day or night travel