BuddyPress.org

You could use the Custom Profile Filters for Buddypress plugin. I know it’s not exactly what you are looking for, but it would enable you let your users identify themselves in one of your 5 categories, then that word they have selected will become a link that will take them to a page will all of the other users who also selected that category.

Perhaps this plugin will give you the building blocks you need to create the solution you need.

https://wordpress.org/extend/plugins/custom-profile-filters-for-buddypress/