[chipaca]

    $ apt-cache search 'words for /usr/share/dict' | sed -e 's/^[^ ]* - //; s/ dictionary words.*//' | sort -u
    American English
    British English
    Bulgarian
    Canadian English
    Catalan
    Esperanto
    French
    German medical
    Irish (Gaeilge)
    Italian
    Manx Gaelic
    Polish
    Spanish
    Swedish
    Ukrainian

[jwilk]

Not every word list package has "words for /usr/share/dict" in the description.

  $ grep-aptavail -wF Provides wordlist -s Package,Description | tbl-dctrl 
  +===================+=======================================================+
  | Package           | Description                                           |
  +-------------------+-------------------------------------------------------+
  | wbulgarian        | Bulgarian dictionary words for /usr/share/dict        |
  | wbrazilian        | Brazilian Portuguese wordlist                         |
  | wdanish           | The Comprehensive Danish Dictionary (DSDO) - wordlist |
  | wdutch            | list of Dutch words                                   |
  | wesperanto        | Esperanto dictionary words for /usr/share/dict        |
  | wogerman          | Traditional German wordlist                           |
  | wngerman          | New German orthography wordlist                       |
  | wswiss            | Swiss (German) orthography wordlist                   |
  | wpolish           | Polish dictionary words for /usr/share/dict           |
  | wfaroese          | Faroese dictionary / wordlist                         |
  | wgalician-minimos | Wordlist for Galician (minimos)                       |
  | wukrainian        | Ukrainian dictionary words for /usr/share/dict        |
  | wportuguese       | European Portuguese wordlist                          |
  | wgerman-medical   | German medical dictionary words for /usr/share/dict   |
  | miscfiles         | Dictionaries and other interesting files              |
  | wnorwegian        | Norwegian word list                                   |
  | wamerican         | American English dictionary words for /usr/share/dict |
  | wamerican-huge    | American English dictionary words for /usr/share/dict |
  | wamerican-insane  | American English dictionary words for /usr/share/dict |
  | wamerican-large   | American English dictionary words for /usr/share/dict |
  | wamerican-small   | American English dictionary words for /usr/share/dict |
  | wbritish          | British English dictionary words for /usr/share/dict  |
  | wbritish-huge     | British English dictionary words for /usr/share/dict  |
  | wbritish-insane   | British English dictionary words for /usr/share/dict  |
  | wbritish-large    | British English dictionary words for /usr/share/dict  |
  | wbritish-small    | British English dictionary words for /usr/share/dict  |
  | wcanadian         | Canadian English dictionary words for /usr/share/dict |
  | wcanadian-huge    | Canadian English dictionary words for /usr/share/dict |
  | wcanadian-insane  | Canadian English dictionary words for /usr/share/dict |
  | wcanadian-large   | Canadian English dictionary words for /usr/share/dict |
  | wcanadian-small   | Canadian English dictionary words for /usr/share/dict |
  | wcatalan          | Catalan dictionary words for /usr/share/dict          |
  | wswedish          | Swedish dictionary words for /usr/share/dict          |
  | wfrench           | French dictionary words for /usr/share/dict           |
  | witalian          | Italian dictionary words for /usr/share/dict/         |
  | wspanish          | Spanish dictionary words for /usr/share/dict          |
  +===================+=======================================================+