language in which keywords can be used as variables

[shri]

hi
i have a parser for a language in which the keywords can used as variable names.

my rule goes something like this

variable:  IDENT
           |all_keywords
;
all_keywords:  /*list of all keywords*/

IDENT is returned from Flex as below
LETTER   [a-zA-Z0-9]

{LETTER}+   { return IDENT;}

naturally this leads to lot of shift reduce conflicts and reduce reduce 
conflicts.

Is there any method wherein i can handle such types of languages in bison?

thanks and regards
srinivas