The best replacement for suffix is prefix.

The best alternatives to suffix are rated as following:
★★★★★  prefix
★★  er
★  postfix
★  prefix dictionary
★  power pro
  inflectional ending
  title
  trilene
  fireline
  power pro braid
  suffixes
  powerpro

Your alternative for suffix is not listed? Suggest!
Speaking about suffix, one probably shouldn't forget about able.

Other search terms related to suffix and their ratings are:
★★★★★ able
★★★ age
★★★ ful
★★ ness
★★ caesar
You have in mind a companion for suffix and it is not yet here? Propose!



Google Trends

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suffix
prefix
er