Allow one word to be in multiple categories ?

[sepeagle]

Dear Developer,

When classify one word into category, I found the current version will only allow one category to be chosen. However, multi-category is a quite necessary feature. For example, I think "cooperate" should be in the category of "Basic Words", and the same time, I want it also in the category of "Derivation" together with "cooperation" . However, I can only choose either "Basic Words" or "Derivation" !

Could you kindly to add a new feature in order to allow one word can be in multi-category ?

Thanks in advance.

Sepeagle