using woocommerce without loading themes

Hi
I want to use Woocommerce without loading themes, but I can not use it’s functions and classes. (For example, when I try to create an object of WC_Order and fetch the order details, it returns nothing). I think it happens because taxonomy names are registered by loading theme. Is there any way to register Woocommerce taxonomies without loading theme? I want to know where does Woocommerce register it’s taxonomies (in which path/directory/file)?

Thanks