The best replacement for middle is side part.

The best alternatives to middle are rated as following:
★★★★★  side part
★★★★  upper class
★★★  center
★★  middle
★★  high school
★★  working class
★  end
★  midst
★  malcolm in the middle
★  centre
★  elementary
  lower
  side parting
  modern family
  in the middle

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Speaking about middle, one probably shouldn't forget about malcolm.

Other search terms related to middle and their ratings are:
★★★★★ malcolm
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middle
side part
upper class