different between dogshit vs dogship

English

dog +? shit

dogshit (uncountable)

dog +? -ship

dogship (countable and uncountable, plural dogships)

dog +? ship

dogship (plural dogships)

(aviation, informal) An experimental model of an aircraft.
- 2005, Malcolm J. Abzug, E. Eugene Larrabee, Airplane Stability and Control (page 103)
  The Sperry Gyroscope Company's DC-3 “dogship” proved the concept in test flights at the Sperry plant in Long Island, New York.
- 2011, Yefim Gordon, Dmitriy Komissarov, Flight Craft 8: Mikoyan MiG-31: Defender of the Homeland (page 16)
  After this, the Mikoyan OKB undertook a redesign of the fuel system; the changes were to be verified on the third production MiG-31, '201 Blue' (f/n 0102-01), a long-serving 'dogship'.

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