spelldump: command not found

Have You tried accessing the binary with the full path?

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 CentOS possible default full paths are:

/usr/bin/spelldump - from package: sphinx

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