Urdu

At the everyday spoken level, yes — Hindi and Urdu are mutually intelligible registers of Hindustani, with shared core grammar, common vocabulary, and identical pronouns and verb forms. The split shows up in writing (Nastaliq vs Devanagari) and in formal vocabulary, where Urdu pulls from Persian and Arabic and Hindi pulls from Sanskrit. A formal Urdu newspaper and a formal Hindi newspaper can look like different languages, but a casual conversation between an Urdu and Hindi speaker is seamless.

Urdu is traditionally written in Nastaliq, a flowing, slanted style of the Perso-Arabic script developed in 14th-century Persia. It's right-to-left, cursive, and notoriously elegant but also harder to typeset than the Naskh style used for Arabic. Modern Urdu publishing relies heavily on Nastaliq fonts that took decades to develop, and Pakistani newspapers still print in Nastaliq even when surrounding ads use Naskh.

Pakistan recognizes Urdu as the national language and uses it in education, media, and government, though most Pakistanis speak a regional language (Punjabi, Sindhi, Pashto, etc.) at home. India has roughly 50 million Urdu speakers, mostly in northern states. Substantial diaspora populations exist in the United Kingdom, the Gulf, the United States, and Canada.

Yes, two: masculine and feminine. Verbs, adjectives, and some postpositions agree. The split-ergative past tense found in Hindi and other Indo-Aryan languages is the same in Urdu — with transitive past verbs, the subject takes ne and the verb agrees with the object. Pronouns, postpositions, and core verb conjugation are essentially identical to Hindi.

The grammar is the same Indo-Aryan structure as Hindi: postpositions, SOV order, gender agreement, split-ergative past. The script is the bigger entry cost — Nastaliq's vertical, slanted ligatures take more time to learn than Devanagari, and many words look ambiguous before context fills in the missing short vowels. Vocabulary at the formal register draws heavily on Persian and Arabic.