Transliteration may be the word you're looking for: "Pyāra" is the transliteration of "प्यार" into the Latin alphabet.
From Wikipedia:
Transliteration is the conversion of a text from one script to another.
For instance, a Latin transliteration of the Greek phrase "Ελληνική Δημοκρατία", usually translated as 'Hellenic Republic', is "Ellēnikḗ Dēmokratía".