The best replacement for straight is flush.

The best alternatives to straight are rated as following:
★★★★★  flush
★★★  curly hair
★★★  strait
★★  curved shaft trimmer
★★  full house
★  3 of a kind
★  curly
★  angled spotting scope
★  angled finish nailer
★  wavy hair
★  bi
★  safety razor
★  curved trimmer
★  neat
  flush wins
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  regular jeans
  helical
  serrated blade
  curve
  three of a kind
  boot jeans
  curved shaft trimmers
  shaped skis
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  yaki straight
  rebond
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  cross cable
  4 of a kind
  circular needles
  helical vanes
  skinny
  crossover cable
  angled finish nailers
  serrated knives
  tapered
  natural hair
  angled spotting scopes
  mixed chiropractor

Your alternative for straight is not listed? Suggest!
Speaking about straight, one probably shouldn't forget about stud finder.

Other search terms related to straight and their ratings are:
★★★★★ stud finder
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Google Trends

Scale is based on the average worldwide traffic of straight in all years. Click on graph for more.
straight
flush
curly hair