Pāṇini sūtras

In a Bahuvrûhi the second member karṇa has acute on the first syllable, when the compound denotes a Name or a Resemblance.

1. sañjñā+aupamyayoḥसञ्ज्ञा+औपम्ययोः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   sस्	saṃjñसंज्ञ्	sañjñāसञ्ज्ञा	name	saṃjñसंज्ञ् + plus āआ
   aअ	aupamyaऔपम्य	aupamyayoḥऔपम्ययोः	resemblance	aupamyऔपम्य् + plus ayoḥअयोः

2. caच

   Part	Lexeme	Sandhi form	Meaning	Stem
   cच्	caच	caच	besides	caच

Anuvṛtti

1. udāttaḥउदात्तः 6·2·64

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   uउ	udāttaउदात्त	udāttaḥउदात्तः	udāttaउदात्त	udāttउदात्त् + plus aḥअः

2. bahuvrīhauबहुव्रीहौ 6·2·106

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   bब्	bahuvrīhiबहुव्रीहि	bahuvrīhauबहुव्रीहौ	bahuvrīhiबहुव्रीहि	bahuvrīhबहुव्रीह् + plus auऔ

3. uttara+pada+ādiḥउत्तर+पद+आदिः 6·2·111

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   uउ	uttaraउत्तर	uttaraउत्तर	last	uttarउत्तर् + plus aअ
   pप्	padaपद	padaपद	word	padपद् + plus aअ
   āआ	ādiआदि	ādiḥआदिः	first syllable	ādआद् + plus iḥइः

4. karṇaḥकर्णः 6·2·112

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   kक्	karṇaकर्ण	karṇaḥकर्णः	karṇa [word]कर्ण [wओर्द्]	karṇकर्ण् + plus aḥअः