Newbie: Indexing Words from a Field

[mcl]

I am a total newbie to MySQL and I was wondering if there is any way I
can speed up searching with indexing.

I have a keywords field containing 'word1,word2,word3,word4'. When I
do my matching of keyword like '%word2%, it takes a long time as I
have over 2 million records in the table.

Is it possible to create indexes of each word and then somehow get the
select statement to use those indexes.

idx-word1 = keywordfield where word1 like "%word1%"
idx-word2 = keywordfield where word1 like "%word2%"

etc

select from table where records are in idx-word2

or would it be best to set up a keyword table with a linkfield id to
the record field id in the main table and refresh the keyword table
after every update.

I was hoping that by using built in indexing it would be quicker and
more efficient.

Any pointers or sites with examples would be gratefully appreciated.

Richard