When creating a linguistic index, I am not able to specify CANADIAN FRENCH. Oracle reports that the NLS parameter string is invalid. I suspect that it's because there is a space in it, but the answer eludes me. Here is a short example of a script that works properly in FRENCH, but not CANADIAN FRENCH. Note that setting the NLS_SORT is not required, but I used that to confirm that I was spelling CANADIAN FRENCH correctly.

Both of these statement result in "Session Altered".

alter session set nls_sort = "FRENCH";
alter session set nls_sort = "CANADIAN FRENCH";

However, only the first of these statements result in a successful index creation:

create index NAMES_FRENCH on PS_NAMES ( NLSSORT( NAME, 'NLS_SORT=FRENCH' ) );
create index NAMES_CANADIAN_FRENCH on PS_NAMES ( NLSSORT( NAME, 'NLS_SORT=CANADIAN FRENCH' ) );

The second gives this result:
Error starting at line 102 in command:
create index NAMES_CANADIAN_FRENCH on PS_NAMES ( NLSSORT( NAME, 'NLS_SORT=CANADIAN FRENCH' ) )
Error at Command Line:102 Column:39
Error report:
SQL Error: ORA-12702: invalid NLS parameter string used in SQL function
12702. 00000 - "invalid NLS parameter string used in SQL function"
*Cause: An unknown parameter name or invalid value is specified in a NLS
parameter string.
*Action:

SQL> create table t ( name varchar2(100));

Table created.

SQL>
SQL> create index NAMES_FRENCH on t ( NLSSORT( NAME, 'NLS_SORT=FRENCH' ) );

Index created.

SQL> create index NAMES_CANADIAN_FRENCH on t ( NLSSORT( NAME, 'NLS_SORT=CANADIAN FRENCH' ) );
create index NAMES_CANADIAN_FRENCH on t ( NLSSORT( NAME, 'NLS_SORT=CANADIAN FRENCH' ) )
                                      *
ERROR at line 1:
ORA-12702: invalid NLS parameter string used in SQL function


SQL> create index NAMES_CANADIAN_FRENCH on t ( NLSSORT( NAME, 'NLS_SORT=CANADIAN_M' ) );

Index created.