Anusvara vs. Visarga

A diacritic used in Indic scripts as a nasal consonant.

Anusvara (Sanskrit: अनुस्वार anusvāra) is a symbol used in many Indic scripts to mark a type of nasal sound, typically transliterated ⟨ṃ⟩. Depending on its location in the word and the language for which it is used, its exact pronunciation can vary.

the voiceless terminal h in Sanskrit

Visarga (Sanskrit: विसर्गः, romanized: visargaḥ) means . In Sanskrit phonology (śikṣā), visarga (also called, equivalently, visarjanīya by earlier grammarians) is the name of a phone voiceless glottal fricative, [h], written as: Visarga is an allophone of /r/ and /s/ in pausa (at the end of an utterance).

Example: ‘sending forth, discharge’;