The best replacement for semantics is syntax.

The best alternatives to semantics are rated as following:
★★★★★  syntax
★★★★  pragmatics
★  semiotics
★  syntactics
★  syntax programming
★  linguistics
★  morphology
  rhetoric
  semantics
  lexical
  etymology
  linguistic
  reference semantics
  lexicon
  meaning
  grammar
  terminology

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Speaking about semantics, one probably shouldn't forget about syntax.

Other search terms related to semantics and their ratings are:
★★★★★ syntax
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semantics
syntax
pragmatics