one of the places to help give you ideas on categorization is to look at how stock & microstock photos do theirs. it is their lifeblood. any photo that is classified wrongly could potentially be lost forever.
Does stop-motion photography qualify anywhere? (Or would it be a sub-set of product?)
And do remote camera 'traps' fit anywhere in the nature section? :think:
wow, that is how i come to learn about new things. can you share briefly on what they are?
by the way for the others, those groupings are in general meant for situations with similar principles and mood. that is why i do not group all people related under portraits becos shootng a single person is different form shooting a group of people or a crowd.