योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-38, verse-54

रक्तनिःस्वनभाङ्कारफेत्कारार्धमृतारवम् ।
शिलामुखललद्रक्तधाराधूतरजःखगम् ॥ ५४ ॥

raktaniḥsvanabhāṅkāraphetkārārdhamṛtāravam ,
śilāmukhalaladraktadhārādhūtarajaḥkhagam 54

54. rakta-niḥsvana-bhāṅkāra-phetkāra-ardha-mṛta-āravam
śilāmukha-lalat-rakta-dhārā-dhūta-rajaḥ-khagam

54. rakta-niḥsvana-bhāṅkāra-phetkāra-ardha-mṛta-āravam
śilāmukha-lalat-rakta-dhārā-dhūta-rajaḥ-khagam

54. It was filled with the sounds of blood, roaring, hissing, and the cries of the half-dead, where streams of blood dripping from stone-tipped arrows washed away the dust from scavenging birds.

Words meanings summery:

• रक्त-निःस्वन-भाङ्कार-फेत्कार-अर्ध-मृत-आरवम् (rakta-niḥsvana-bhāṅkāra-phetkāra-ardha-mṛta-āravam) - having sounds of blood, roaring, hissing, and cries of the half-dead

• शिलामुख-ललत्-रक्त-धारा-धूत-रजः-खगम् (śilāmukha-lalat-rakta-dhārā-dhūta-rajaḥ-khagam) - having birds whose dust was washed away by streams of blood dripping from stone-tipped arrows

Words meanings and morphology

रक्त-निःस्वन-भाङ्कार-फेत्कार-अर्ध-मृत-आरवम् (rakta-niḥsvana-bhāṅkāra-phetkāra-ardha-mṛta-āravam) - having sounds of blood, roaring, hissing, and cries of the half-dead

(adjective)

Accusative, neuter, singular of rakta-niḥsvana-bhāṅkāra-phetkāra-ardha-mṛta-ārava

rakta-niḥsvana-bhāṅkāra-phetkāra-ardha-mṛta-ārava - having sounds of blood, roaring, hissing, and cries of the half-dead

Bahuvrīhi compound, describing something that possesses these attributes.

Compound type : bahuvrīhi (rakta+niḥsvana+bhāṅkāra+phetkāra+ardha-mṛta+ārava)

• rakta – blood; red
  noun (neuter)
  Past Passive Participle (of rañj)
  Root √rañj (to color) -> rakta (colored, red, blood)
  Root: rañj (class 1)
• niḥsvana – sound, noise
  noun (masculine)
  Derived from niḥ + √svan (to sound)
  Prefix: niḥ
  Root: svan (class 1)
• bhāṅkāra – roaring, rumbling sound
  noun (masculine)
  Onomatopoeic formation
• phetkāra – hissing, snorting sound, sound of goblins
  noun (masculine)
  Onomatopoeic formation
• ardha-mṛta – half-dead
  adjective (masculine)
  Tatpuruṣa compound: ardha (half) + mṛta (dead)
• ārava – sound, cry, roar
  noun (masculine)
  Derived from ā-√ru (to cry out)
  Prefix: ā
  Root: ru (class 2)

Note: Adjective, agreeing with an implied neuter noun.

शिलामुख-ललत्-रक्त-धारा-धूत-रजः-खगम् (śilāmukha-lalat-rakta-dhārā-dhūta-rajaḥ-khagam) - having birds whose dust was washed away by streams of blood dripping from stone-tipped arrows

(adjective)

Accusative, neuter, singular of śilāmukha-lalat-rakta-dhārā-dhūta-rajaḥ-khaga

śilāmukha-lalat-rakta-dhārā-dhūta-rajaḥ-khaga - having birds whose dust was washed away by streams of blood dripping from stone-tipped arrows

Bahuvrīhi compound, describing something that possesses these attributes.

Compound type : bahuvrīhi (śilāmukha+lalat+rakta-dhārā+dhūta+rajaḥ+khaga)

• śilāmukha – stone-tipped (arrow), arrow with a stone point
  noun (masculine)
  Tatpuruṣa compound: śilā (stone) + mukha (mouth/tip)
• lalat
  
• rakta-dhārā – stream of blood
  noun (feminine)
  Tatpuruṣa compound: rakta (blood) + dhārā (stream)
• dhūta
  
• rajaḥ – dust, pollen, impurity
  noun (neuter)
• khaga – bird, sky-goer (arrow, cloud, deity)
  noun (masculine)
  Derived from kha (sky) + √gam (to go)
  Root: gam (class 1)

Note: Adjective, agreeing with an implied neuter noun.