backer (n.)

• abettor
• acquaintance
• admirer
• advocate
• aficionado
• aid
• aider
• ally
• almoner
• almsgiver
• angel
• apologist
• assignor
• benefactor
• benefactress
• bestower
• bettor
• brother
• buff
• champion
• conferrer
• confidant
• confidante
• consignor
• contributor
• defender
• dependence
• donor
• endorser
• exponent
• familiar
• fan
• fellow
• friend
• giver
• grantor
• guarantor
• help
• helper
• intimate
• investor
• lover
• mainstay
• maintainer
• ministrant
• neighbor
• partisan
• patron
• patroness
• philanthropist
• pickup
• presenter
• promoter
• protagonist
• punter
• reliance
• repository
• second
• seconder
• sectary
• settler
• sider
• sponsor
• stalwart
• standby
• subscriber
• succorer
• support
• supporter
• surety
• sustainer
• sympathizer
• testate
• testator
• testatrix
• underwriter
• upholder
• votary
• well-wisher