Phoebe: Minister of the Word

What did Paul mean when he used the word for โ€œdeaconโ€ and the word for โ€œbenefactorโ€ but also โ€œchurch officialโ€ (in the Septuagint) in association with Phoebeโ€™s service to Paul and to the Body of Christ? What was Paul assuming his readers would already know and understand, so it went without being said?