वाल्मीकि-रामायणम् vālmīki-rāmāyaṇam - book-1, chapter-38, verse-20

नागानां वध्यमानानामसुराणां च राघव ।
राक्षसानां च दुर्धर्षः सत्त्वानां निनदो ऽभवत् ॥२०॥

20. nāgānāṃ vadhyamānānāmasurāṇāṃ ca rāghava ,
rākṣasānāṃ ca durdharṣaḥ sattvānāṃ ninado'bhavat.

20. nāgānām vadhyamānānām asurāṇām ca rāghava |
rākṣasānām ca durdharṣaḥ sattvānām ninadaḥ abhavat

20. rāghava,
vadhyamānānām nāgānām ca asurāṇām ca rākṣasānām ca sattvānām,
durdharṣaḥ ninadaḥ abhavat

20. O Rāghava, a formidable roar arose from the Nāgas, Asuras, Rākṣasas, and other beings who were being slain.

Words meanings summery:

• नागानाम् (nāgānām) - of the Nāgas, of the serpents

• वध्यमानानाम् (vadhyamānānām) - of those being killed, of those being slain

• असुराणाम् (asurāṇām) - of the Asuras, of the demons

• च (ca) - and

• राघव (rāghava) - Referring to Rāma (O Rāghava, O descendant of Raghu)

• राक्षसानाम् (rākṣasānām) - of the Rākṣasas, of the demons/ogres

• च (ca) - and

• दुर्धर्षः (durdharṣaḥ) - irresistible, formidable, unassailable

• सत्त्वानाम् (sattvānām) - of the beings, of the creatures

• निनदः (ninadaḥ) - a roar, a loud sound, a cry

• अभवत् (abhavat) - it was, it occurred, it arose

Words meanings and morphology

नागानाम् (nāgānām) - of the Nāgas, of the serpents

(noun)

Genitive, masculine, plural of nāga

nāga - a serpent, a snake, a Nāga (a semi-divine race of serpent-beings)

वध्यमानानाम् (vadhyamānānām) - of those being killed, of those being slain

(participle)

Genitive, masculine, plural of vadhyamāna

vadhyamāna - being killed, being slain

Present Passive Participle

Derived from √vadh (to strike, to kill)

Root: vadh (class 1)

असुराणाम् (asurāṇām) - of the Asuras, of the demons

(noun)

Genitive, masculine, plural of asura

asura - a demon, a titan, an Asura (a class of mythological beings often in opposition to the Devas)

च (ca) - and

(indeclinable)

राघव (rāghava) - Referring to Rāma (O Rāghava, O descendant of Raghu)

(proper noun)

Vocative, masculine, singular of rāghava

rāghava - descendant of Raghu, a patronymic often referring to Rāma

राक्षसानाम् (rākṣasānām) - of the Rākṣasas, of the demons/ogres

(noun)

Genitive, masculine, plural of rākṣasa

rākṣasa - a Rākṣasa (a class of demonic beings or ogres), a demon

च (ca) - and

(indeclinable)

दुर्धर्षः (durdharṣaḥ) - irresistible, formidable, unassailable

(adjective)

Nominative, masculine, singular of durdharṣa

durdharṣa - difficult to attack or conquer, irresistible, formidable

compound of dur (difficult) and dharṣa (to attack)

Compound type : tatpurusha (dur+dharṣa)

• dur – difficult, bad
  indeclinable
• dharṣa – attacking, assailing
  noun (masculine)
  Derived from root dhṛṣ
  Root: dhṛṣ (class 5)

सत्त्वानाम् (sattvānām) - of the beings, of the creatures

(noun)

Genitive, neuter, plural of sattva

sattva - being, creature, essence, reality, goodness, courage

Root: as (class 2)

निनदः (ninadaḥ) - a roar, a loud sound, a cry

(noun)

Nominative, masculine, singular of ninada

ninada - a loud sound, a roar, a cry, a noise

from ni-√nad

Prefix: ni

Root: nad (class 1)

अभवत् (abhavat) - it was, it occurred, it arose

(verb)

3rd person , singular, active, imperfect (laṅ) of bhū

Root: bhū (class 1)