penny ante poker vs penny ante

penny ante poker and penny ante both are nouns.

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

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

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