standby (n.)
- abettor
- admirer
- advocate
- aficionado
- angel
- apologist
- backer
- buff
- champion
- defender
- dependence
- endorser
- exponent
- extra
- fan
- lover
- mainstay
- maintainer
- mute
- partisan
- patron
- promoter
- protagonist
- reliance
- second
- seconder
- sectary
- sider
- sponsor
- stalwart
- stand-in
- substitute
- super
- supernumerary
- support
- supporter
- sustainer
- sympathizer
- understudy
- upholder
- votary
- walk-on
- well-wisher
