gnome-specimen software package provides Simple font preview and compare application for GNOME, 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 gnome-specimen
gnome-specimen is installed in your system.
Make ensure the gnome-specimen package were installed using the commands given below,
$ sudo dpkg-query -l | grep gnome-specimen *
You will get with gnome-specimen package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | GNOME |
| Package | gnome-specimen |
| Version | 0.4-8 |
| Description | Simple font preview and compare application for GNOME |
| Sub Section | gnome |