tathā hi ta eva bhedā avivakṣitabhedāḥ sāmānyamiti sarvatra jātiśabdair upādīyanta iti yadṛcchāśabdā jātiśabdebhyaḥ pṛthaglakṣaṇakāreṇa nirdiṣṭā ity āha prasiddhestviti /
For those very differences, when their differences are not meant to be expressed, are taken up everywhere by words denoting universals as [being] the universal - thus proper names have been indicated separately from words denoting universals by the author of the definition, which is what is stated by [the words] "due to common usage."