The best replacement for complement is supplement.

The best alternatives to complement are rated as following:
★★★★★  supplement
★★★★  compliment
★★★  substitute
★★  adjunct
★★  object
★  modifier
★  substitute economics
★  compliment grammar
★  compliment definition
★  supplement math
  insult
  2\u0027s complement
  supplement angles
  cytokines
  compliment difference
  predicate adjective
  2's complement
  adverbial
  direct object
  complement
  predicate nominative
  reverse and complement
  1\u0027s complement
  predicate
  1's complement
  two\u0027s complement
  two's complement

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

Other search terms related to complement and their ratings are:
★★★★★ overflow
★ transitive verb
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complement
supplement
compliment