penny ante vs penny ante poker

penny ante and penny ante poker both are nouns.

Word	Noun	Adjective	Verb	Adverb
penny ante	Yes	No	No	No
penny ante poker	Yes	No	No	No

As nouns, penny ante and penny ante poker are synonyms defined as:

penny ante (noun)	penny ante poker (noun)
poker played for small stakes	poker played for small stakes
a business deal on a trivial scale