There are quite a few names to avoid in your scripts. Even if there are not reserved-words, keep away !
I’ll start with test
cd $HOME/bin
vi test
echo hello world
chmod +x test
./test
hello world
The problem is that it may break your other scripts
$ ssh localhost test 1 = 2 && echo WHAT???
hello world
WHAT???
And it may break sooner or later, depending on your OS / version / default shell / default path / others.
There are quite a few filenames you should not use, like test, date, time, hostname, mail, view, touch, sort and make. The command type lists some of those as reserved word, shell builtin, tracked alias, shell keyword. But again it is not consistent over Unix flavors.
$ uname -sr; type date
SunOS 5.10
date is /usr/bin/date
$ uname -sr; type date
Linux 2.6
date is a tracked alias for /bin/date
Your sysadmin may also alias things for colors and safety in the common profile: for instance vi, ls, rm. But if it annoys you, then use \vi instead of vi.