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NFL (national football league)
NCAAF (college football)
XFL (X-treme football---banned)
AFL (Arena football league)
UFL (United Football league)
CFL (Canadian Football League)
EFL (European Football League)
Everton were the Football League Champions in 1891.
NFL stands for "National Football League," which is the professional football league in the USA.
CFL stands for "Canadian Football League," which is the professional football league in Canada.
Sunderland were the Football League Champions in 1902.
Derby County were the Football League Champions in 1972.