double feature vs twin bill

double feature and twin bill both are nouns.

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

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

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

Other synonyms of double feature include doubleheader.

double feature (noun)	twin bill (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)