twin bill vs double feature

twin bill and double feature both are nouns.

Word	Noun	Adjective	Verb	Adverb
twin bill	Yes	No	No	No
double feature	Yes	No	No	No

As nouns, twin bill and double feature are synonyms defined as:

twin bill and double feature: two games instead of one (especially in baseball when the same two teams play two games on the same day)

Other synonyms of twin bill include doubleheader.

twin bill (noun)	double feature (noun)
two games instead of one (especially in baseball when the same two teams play two games on the same day)	two games instead of one (especially in baseball when the same two teams play two games on the same day)