Synonym epoch. Webster' s Unabridged makes these words almost synonymous, but "era" usually connotes a span of time rather than a point in time.

In addition suitable contents:
[ = ] [ al ] [ am ] [ an ] [ ar ] [ arc ] [ at ] [ b ] [ br ] [ bridge ] [ bs ] [ ch ] [ co ] [ con ] [ du ] [ ed ] [ epoch ] [ er ] [ es ] [ fi ] [ file ] [ ge ] [ h ] [ hr ] [ id ] [ il ] [ in ] [ int ] [ ke ] [ Lex ] [ ly ] [ ma ] [ mo ] [ mod ] [ module ] [ na ] [ nn ] [ no ] [ nym ] [ pa ] [ ph ] [ point ] [ query ] [ rc ] [ re ] [ S ] [ se ] [ st ] [ su ] [ sy ] [ th ] [ ua ] [ us ] [ Web ] [ Webster ] [ word ]