The best replacement for tenor is alto sax.

The best alternatives to tenor are rated as following:
★★★★★  alto sax
★★★★  baritone
★★★★  soprano ukulele
★★★  concert ukulele
★★★  alto
★★★  tenure
★★★  bass
★★  baritone ukulele
★★  soprano
★  alto saxophone
★  baritone sax
★  soprano uke
★  bass trombone
★  plectrum banjo
★  vehicle
★  concert uke
★  alto higher
★  maturity
★  plectrum
  concert
  soprano sax
  super tenor ukulele
  bass singing
  term
  an alto

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Speaking about tenor, one probably shouldn't forget about charice.

Other search terms related to tenor and their ratings are:
★★★★★ charice
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tenor
alto sax
baritone