bills
A U.S. legislative measure is a bill until enacted; it then becomes an act or a law.
Descriptive references to pending legislation should be lowercase (food-stamp bill, appropriation bill) except for words normally capitalized:
Senate bill 217 (S. 217)
House bill 31 (H.R. 31)
Kiess bill
Walsh-Healey bill
but Reform Bill of 1832 (England)
GI Bill
GI Bill of Rights