Can I define a macro with same name as an already defined command?

Question

Somewhere in my document, I have a

\newcommand{\macomm}{blabla}

Later, I would like to define a TeX macro with the same name:

\def\macomm{blabla}

So my questions:

Is it possible?
Will this make any problem?
Should/can I "kill" the definition of the command, before defining the TeX macro?

If you do \def\macomm{...} inside a group, when the group ends the previous definition will be restored. — egreg, Jun 12 '12 at 08:29
\def overwrites an existing definition. No need to kill it before. — cgnieder, Jun 12 '12 at 08:30
TeX macros and LaTeX commands are the same thing, in that \newcommand{\foo}{bar} and \def\foo{bar} both create a macro called \foo with expansion bar. See What is the difference between \def and \newcommand? — Joseph Wright, Jun 12 '12 at 08:30

score 9 · Accepted Answer · answered Jun 12 '12 at 10:00

Yes
The \def will overwrite without warning the previous meaning of \macomm. Only you can decide if this is a problem.
The \def already "kills" the previous definition.

The main question is why you want to use TeX-syntax in the second case. Why don't you use \renewcommand\macomm{blub}?

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