porter vs Pullman porter

porter and Pullman porter both are nouns.

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

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

porter and Pullman porter: a railroad employee who assists passengers (especially on sleeping cars)

porter (noun)	Pullman porter (noun)
a very dark sweet ale brewed from roasted unmalted barley	a railroad employee who assists passengers (especially on sleeping cars)
a person employed to carry luggage and supplies
a railroad employee who assists passengers (especially on sleeping cars)
someone who guards an entrance

porter (verb)	Pullman porter (verb)
carry luggage or supplies