Definition: cognate, homophonic: a letter belonging to the same technical category of letters possessing an identical place of utterance and internal effort cf. तुल्यास्यप्रयत्नं सवर्णम् P. 1, 1. 9. For example, the eighteen varieties of अ, due to its short, long and protracted nature as also due to its accents and nasalization, are savarna to each other. The vowels ऋ and लृ are prescribed to be considered as Savarna although their place of utterance differs. The consonants in each class of consonants are savarna to one another, but by the utterance of one, another cannot be taken except when the vowel उ has been applied to the first. Thus कु stands for क्, ख्, ग्, घ् and ङ्. cf. तुल्यास्यप्रयत्नं सवर्णम् P. 1, I. 9 and अणुदित्सवर्णस्य चाप्रत्यय: P. I. 1. 69.