ambiguous_words: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/ambiguous_words - from package: tesseract-ocr

You may install the required package with command apt-get install {package}

Error in other languages:
ambiguous_words: bevel nie gevind nie
ambiguous_words: comandă negăsită
ambiguous_words: comando não encontrado
ambiguous_words: commande introuvable
ambiguous_words: command not found
ambiguous_words: käsku ei ole
ambiguous_words: không tìm thấy lệnh
ambiguous_words: komanda nerasta
ambiguous_words: Kommando nicht gefunden.
ambiguous_words: kommandot finns inte
ambiguous_words: komut yok
ambiguous_words: nie znaleziono polecenia
ambiguous_words: níor aimsíodh an t-ordú
ambiguous_words: no se encontró la orden
ambiguous_words: no s'ha trobat l'ordre
ambiguous_words: opdracht niet gevonden
ambiguous_words: parancs nem található
ambiguous_words: perintah tidak ditemukan
ambiguous_words: príkaz nenájdený
ambiguous_words: příkaz nenalezen
ambiguous_words: команда не найдена
ambiguous_words: командата не е открита
ambiguous_words: 命令找不到
ambiguous_words: コマンドが見つかりません