वाल्मीकि-रामायणम् vālmīki-rāmāyaṇam - book-6, chapter-81, verse-13

तथा गदाभिर्गुर्वीभिः प्रासैः खड्गैः परश्वधैः ।
निर्जघ्नुर्वानरान् घोरान् राक्षसाः पर्वतोपमाः ॥१३॥

13. tathā gadābhirgurvībhiḥ prāsaiḥ khaḍgaiḥ paraśvadhaiḥ ,
nirjaghnurvānarān ghorān rākṣasāḥ parvatopamāḥ.

13. tathā gadābhiḥ gurvībhiḥ prāsaiḥ khaḍgaiḥ paraśvadhaiḥ
nirjaghnuḥ vānarān ghorān rākṣasāḥ parvatopamāḥ

13. तथा पर्वतोपमाः राक्षसाः गुर्वीभिः गदाभिः प्रासैः
खड्गैः परश्वधैः (च) घोरान् वानरान् निर्जघ्नुः

13. In the same way, the mountain-sized demons (rākṣasas) slew the formidable monkeys with heavy maces, spears, swords, and battle-axes.

Words meanings summery:

• तथा (tathā) - similarly, thus

• गदाभिः (gadābhiḥ) - with maces

• गुर्वीभिः (gurvībhiḥ) - with heavy

• प्रासैः (prāsaiḥ) - with spears

• खड्गैः (khaḍgaiḥ) - with swords

• परश्वधैः (paraśvadhaiḥ) - with battle-axes

• निर्जघ्नुः (nirjaghnuḥ) - they slew, they killed

• वानरान् (vānarān) - monkeys

• घोरान् (ghorān) - terrible, fierce, formidable

• राक्षसाः (rākṣasāḥ) - demons, rākṣasas

• पर्वतोपमाः (parvatopamāḥ) - mountain-like, resembling mountains

Words meanings and morphology

तथा (tathā) - similarly, thus

(indeclinable)

गदाभिः (gadābhiḥ) - with maces

(noun)

Instrumental, feminine, plural of gadā

gadā - mace, club

गुर्वीभिः (gurvībhiḥ) - with heavy

(adjective)

Instrumental, feminine, plural of gurvī

gurvī - heavy, weighty, great (feminine form of guru)

प्रासैः (prāsaiḥ) - with spears

(noun)

Instrumental, masculine, plural of prāsa

prāsa - spear, dart, javelin

खड्गैः (khaḍgaiḥ) - with swords

(noun)

Instrumental, masculine, plural of khaḍga

khaḍga - sword, rhinoceros

परश्वधैः (paraśvadhaiḥ) - with battle-axes

(noun)

Instrumental, masculine, plural of paraśvadha

paraśvadha - battle-axe, axe

निर्जघ्नुः (nirjaghnuḥ) - they slew, they killed

(verb)

3rd person , plural, active, perfect (lit) of nir-han

Prefix: nis

Root: han (class 2)

वानरान् (vānarān) - monkeys

(noun)

Accusative, masculine, plural of vānara

vānara - monkey

घोरान् (ghorān) - terrible, fierce, formidable

(adjective)

Accusative, masculine, plural of ghora

ghora - terrible, dreadful, formidable, awful

राक्षसाः (rākṣasāḥ) - demons, rākṣasas

(noun)

Nominative, masculine, plural of rākṣasa

rākṣasa - demon, rākṣasa, belonging to a rākṣasa

पर्वतोपमाः (parvatopamāḥ) - mountain-like, resembling mountains

(adjective)

Nominative, masculine, plural of parvatopama

parvatopama - mountain-like, resembling a mountain

Compound type : tatpuruṣa (parvata+upama)

• parvata – mountain, hill
  noun (masculine)
• upama – resemblance, simile, like
  noun (masculine)