MACROMEDIA FLASH 8-LEARNING ACTIONSCRIPT 2.0 IN FLASH Manual page 735

The following table lists reserved keywords in ActionScript 2.0 that cause errors in your
scripts when used as variable names:
add
catch
delete
eq
for
gt
import
intrinsic
new
onClipEvent
return
switch
try
while
The following words are reserved for future use in Flash, from the ECMAScript (ECMA-262)
edition 4 draft language specification. Avoid using these words because they might be used in
future releases of Flash.
as
char
enum
goto
native
synchronized
volatile
and
class
do
extends
function
if
in
le
not
or
set
tellTarget
typeof
with
abstract
const
export
is
package
throws
break
continue
dynamic
false
ge
ifFrameLoaded
instanceof
it
null
private
static
this
var
Boolean
debugger
final
long
protected
transient
case
default
else
finally
get
implements
interface
ne
on
public
super
throw
void
bytes
double
float
namespace
short
use
Naming conventions 735