noun

A person who publicly supports or recommends a particular cause or policy.

he was an untiring advocate of economic reform

champion,upholder,supporter,backer,promoter,proponent,exponent,protector,patron

transitive verb

Publicly recommend or support.

they advocated an ethical foreign policy

recommend,prescribe,commend,advise,favour,approve of,support,back,uphold,subscribe to,champion,campaign on behalf of,stand up for,speak for,argue for,plead for,press for,lobby for,urge,promote,espouse,endorse,sanction,vouch for