The best replacement for duplex is townhouse.

The best alternatives to duplex are rated as following:
★★★★★  townhouse
★★★★  simplex
★★★★  condo
★★★★  apartment
★★★  half duplex
★★★  doppler
★★  single family home
★★  full duplex
★★  fourplex
★  doppler ultrasound
★  simplex printing
★  triplex
★  simplex fiber
★  twin home
★  wide duplex
★  mil dot reticle
★  mil dot
  super duplex
  townhome
  semi-detached
  simplex scanning
  auto negotation
  fine duplex
  twinplex
  mildot
  single family
  boone & crockett reticle
  booklet
  half plex
  duplex
  single family homes
  townhouse definition
  duet
  long range duplex
  half

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Google Trends

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duplex
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