SELECT
  words.id, words.definition
FROM
  words, stock, languages, stockmatch, types

WHERE
  words.typeID = types.id
AND
  stock.languageID = languages.id
AND
  stockmatch.stockID = stock.id
AND
  stockmatch.wordID = words.id

AND stock.word = ?
AND languages.name = ?
AND types.name = ?
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you just need some whitespace in your SQL =P that and sticking to plural/non-plural for your table names.