Doc and Resident physician

Doc noun - A person specially trained in healing human medical disorders.

Resident physician and doc are semantically related. In some cases you can replace phrase "Resident physician" with "Doc", this terms are similar.

Resident physician noun - A physician (especially an intern) who lives in a hospital and cares for hospitalized patients under the supervision of the medical staff of the hospital.

Doc and resident physician are semantically related. You can use "Doc" instead a noun phrase "Resident physician".