The following list indicates words you must not use for ColdFusion variables, user-defined function names, or custom tag names. Although you can safely use some of these words in some situations, you can prevent errors by avoiding them entirely.

Built-in function names, such as Now or Hash can be used as variable names except for the following functions:
- ParameterExists
- PreserveSingleQuotes
- QuotedValueList
- ValueList

Note:

You cannot use Built-in Function names as User-Defined Function names. You can, however, use Built-in Function names as User-Defined Function names, when you define the function in a cfc .

Scope names, such as Form or Session.
Operators, such as NEQ or IS. For more information, see Operators and expressions.
The following language elements are keywords in a script syntax:
- for
- default
- switch
- case
- continue
- import
- finally
- local (inside function declaration)
- interface
- pageencoding
- return
- try
- catch
- in
- else
- if
- while
- do
- break
The following elements are reserved in both script and tags:
- function
- true
- false
- final
- abstract
- null – can be used as variable names but not as User-Defined Function name.
You cannot use cfimport as a variable in a script synatx .
You cannot use tag names as User-Defined Functions in both tags and script syntaxes.

Reserved words

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