Google Keyword Planner does not show you all
the keywords in a given category or even keyword theme.
Not exact matches
Typically used
in conjunction with AdWords, this tool
gives you a robust look at the search volume for
keywords at the specific and
category - wide level.
In reply to a comment I had made, a lovely woman by the name of Anthea Lawson wrote me to
give me some ideas about
categories and
keywords.