The Amarakosha (Devanagari: अमरकोशः, IAST: Amarakośaḥ, ISO: Amarakōśaḥ) is the popular name for Namalinganushasanam (Devanagari: नामलिङ्गानुशासनम्, IAST: Nāmaliṅgānuśāsanam, ISO: Nāmaliṅgānuśāsanam, which means "instruction concerning nouns and gender") a thesaurus in Sanskrit written by the ancient Indian scholar Amarasimha.
[1] The name Amarakosha derives from the Sanskrit words amara ("immortal") and kosha ("treasure, casket, pail, collection, dictionary").
The following verses give the different names of Brahmā, Viṣṇu, Vasudeva, Balarāma, Kāmadeva, Lakṣmī, Kṛṣṇa, Śiva, Indra, etc.
The ten Vargas are Bhuvarga (Earth), Puravarga (Towns or Cities), Shailavarga (Mountains), Vanoshadivarga (Forests and medicines), Simhadivarga (Lions and other animals), Manushyavarga (Mankind), Bramhavarga (Brahmana), Kshatriyavarga (Kshatriya), Vysyavarga (Vaishya) and Sudravarga (Sudra).
[citation needed] The Third Kanda, Sāmānyādikāṇḍa contains Adjectives, Verbs, words related to prayer, business, etc.
The Pali thesaurus Abhidhānappadīpikā, composed in the twelfth century by the grammarian Moggallāna Thera, is based on the Amarakosha.