Nouns

(n)advocate, advocator, proponent, exponenta person who pleads for a cause or propounds an idea
(n)advocate, counsel, counselor, counsellor, counselor-at-law, pleadera lawyer who pleads cases in court

Verbs

(v)recommend, urge, advocatepush for something“The travel agent recommended strongly that we not travel on Thanksgiving Day”
(v)preach, advocatespeak, plead, or argue in favor of“The doctor advocated a smoking ban in the entire house”