hunspell-es software package provides Spanish dictionary for hunspell, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install hunspell-es
hunspell-es is installed in your system.
Make ensure the hunspell-es package were installed using the commands given below,
$ sudo dpkg-query -l | grep hunspell-es *
You will get with hunspell-es package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Text Processing |
| Package | hunspell-es |
| Version | 1:5.2.1-2 |
| Description | Spanish dictionary for hunspell |
| Sub Section | Text |