How do you say letter in Sanskrit?
— वर्ण (m) (várṇa)

Generic synonyms for letter in Sanskrit
writeलिख्
Specialized synonyms for letter in Sanskrit
consonantव्यञ्जन (m) (vyáñjana)
sinपाप (m) (pāpá)
vowelस्वर (m) (svará)
Group relationships for letter in Sanskrit
alphabetअक्षरसमाम्नाय (m) (akSarasamAmnAya)