Is it possible to create a full text index on a VIEW?

If so, given two columns column1 and column2 on a VIEW, what is the SQL to get this done?

The reason I'd like to do this is I have two very large tables, where I need to do a FULLTEXT search of a single column on each table and combine the results. The results need to be ordered as a single unit.

Suggestions?

EDIT: This was my attempt at creating a UNION and ordering by each statements scoring.

(SELECT a_name AS name, MATCH(a_name) AGAINST('$keyword') as ascore 
     FROM a WHERE MATCH a_name AGAINST('$keyword'))
UNION  
(SELECT s_name AS name,MATCH(s_name) AGAINST('$keyword') as sscore 
     FROM s WHERE MATCH s_name AGAINST('$keyword'))
ORDER BY (ascore + sscore) ASC

sscore was not recognized.