I'd recommend using the File List functionality where you can save the keywords in a text file and reference them from the program. This link has a good example of how to use File Lists:
How can I search a list of keywords inside files?
To see the keywords found simply go to the reporting tab and select the Keyword Summary report:

FileLocator Pro 6.5 or earlier
For versions of FileLocator Pro prior to version 7 you can still see a list of keywords it's just a little harder. After running the search you can export the unique list of found keywords using a custom format:
- Click the File->Export Results... menu option
- Select the 'Custom (XSLT)' format option
- Browse to the Sample Transforms folder and pick the file:
unique_hits_only.xsl
- Click the Export button
The unique hits should now be in your file/clipboard.
Counting the hits
If you want a count of the hits you can use a slightly modified version of the custom format. Save the XSL shown below into a text file called 'unique_hit_count.xsl' and select that in the 'Custom (XSLT)' edit box.
<?xml version="1.0"?>
<!-- Hits only Transform with count
Copyright (C) Mythicsoft Ltd 2012. All rights reserved.
Produces output that contains just the hits found in a search along with an occurrence count,
i.e. without any file information or extra found text information.
-->
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:rslt="http://www.mythicsoft.com/FileLocator_16Aug2005"
version="1.0">
<xsl:output method="text" indent="yes"/>
<xsl:key name="hits-value" match="rslt:hit" use="substring(../rslt:text, @rslt:exprstart + 1, @rslt:exprlength)" />
<xsl:template match="/">
<xsl:apply-templates select="//rslt:hit"/>
</xsl:template>
<xsl:template match="rslt:hit">
<xsl:if test="generate-id() = generate-id(key('hits-value', substring(../rslt:text, @rslt:exprstart + 1, @rslt:exprlength)))">
<xsl:value-of select="substring(../rslt:text, @rslt:exprstart + 1, @rslt:exprlength)"/>
<xsl:text> - </xsl:text>
<xsl:value-of select="count( key('hits-value', substring(../rslt:text, @rslt:exprstart + 1, @rslt:exprlength)) )"/>
<xsl:text>
</xsl:text>
</xsl:if>
</xsl:template>
</xsl:stylesheet>