The best replacement for vocabulary is grammar.

The best alternatives to vocabulary are rated as following:
★★★★★  grammar
★★★  vocabularies
★★★  spelling
★★  lexicon
★★  natural language
★  keyword
★  english vocabulary
★  passive vocabulary
★  sight words
★  reading comprehension
★  controlled vocabulary
★  expressive vocabulary
★  american vocabulary
★  lexis
★  domain specific
  comprehension
  fluency
  ontology
  productive vocabulary
  context clues
  vocabulary words
  academic vocabulary
  uncontrolled vocabulary
  content vocabulary
  free text
  spanish vocabulary
  british vocabulary

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Speaking about vocabulary, one probably shouldn't forget about context clues.

Other search terms related to vocabulary and their ratings are:
★★★★★ context clues
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vocabulary
grammar
vocabularies