bus is a kind of public transportation
bus is form_of_public_transportation. bus is not public_transport. bus is public_transport. buses is not common_form_of_public_transportation. bus is not public_transportation_device. buses is not common_type_fo_public_transportation. bus is public_transportation_device. buses is common_form_of_public_transportation. buses is common_type_fo_public_transportation. bus is not form_of_public_transportation.