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Chapter 4.
- Marshals
- National Park
- Natural Resources Conservation
- Postal
- Secret (Homeland Security)
- Selective (see also System); but selective service, in general sense; selective service classification 1-A, 4-F, etc.
- Senior Executive
- service:
- airmail
- Army
- city delivery
- consular
- customs
- diplomatic
- employment (State)
- extension (State)
- general delivery
- naval
- Navy
- parcel post
- postal field
- rural free delivery; rural delivery; free delivery
- special delivery
- star route
- Shelf, Continental (see Continental)
- ship of state (unless personified)
- Sister(s) (adherent of religious order)
- Six Nations (see Indians)
- Smithsonian Institution (see Institution)
- Social Security Administration (U.S.),
- application, check, number, pension,
- trust fund, system, etc.
- Socialist Party; a Socialist
- Society, if part of name; the society:
- American Cancer Society, Inc.
- of the Cincinnati
- soil bank
- soil orders:
- Alfisols
- Andisols
- Aridisols
- Entisols
- Gelisols
- Histosols
- Inceptisols
- Mollisols
- Oxisols
- Spodosols
- Ultisols
- Vertisols
- Soldiers' Home; the soldiers' home; (see Armed Forces Retirement Home)
- Solicitor for the Department of Labor, etc.; the Solicitor
- Solicitor General (Department of Justice)
- Son of Man (Christ)
- Sons of the American Revolution (organization); a Son; a Real Son
- South:
- American Republics (see Republic)
- American States
- Atlantic
- Atlantic States
- Deep South (U.S.)
- Korea
- Midsouth (U.S.)
- Pacific
- Pole
- the South (section of United States); Southland
- Southeast Asia
- southern California, southeastern California, etc.
- Southern States
- Southern United States
- southerner
- Southwest, the (section of United States)
- space shuttle; the shuttle
- space station
- Spanish-American War (see War)
- Speaker of the House of Representatives; the Speaker
- special agent
- specialist
- Special Order No. 12; Special Orders, No. 12; a special order
- Spirit of '76 (painting); but spirit of '76 (in general sense)
- Sputnik
- Square, Lafayette, etc.; the square