Pāṇini sūtras

The word gavâśva, and others are also Dvandva compounds which take the singular number.

1. gava+aśva+prabhṛtīniगव+अश्व+प्रभृतीनि

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   gग्	goगो	gavaगव	go [word]	goगो + plus vaव
   aअ	aśvaअश्व	aśvaअश्व	aśva [word]अश्व [wओर्द्]	aśvअश्व् + plus aअ
   pप्	prabhṛtiप्रभृति	prabhṛtīniप्रभृतीनि	beginning	prabhṛtप्रभृत् + plus īniईनि

2. caच

   Part	Lexeme	Sandhi form	Meaning	Stem
   cच्	caच	caच	besides	caच

Anuvṛtti

1. ekavacanamएकवचनम् 2·4·1

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   eए	ekavacanaएकवचन	ekavacanamएकवचनम्	singular	ekavacanएकवचन् + plus amअम्

2. dvandvaḥद्वन्द्वः 2·4·2

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   dद्	dvaṃdvaद्वंद्व	dvandvaḥद्वन्द्वः	DvaṃdvaDवंद्व	dvaṃdvद्वंद्व् + plus aḥअः