1. The language: Hindi is an Indo-Aryan language spoken primarily in India. It is the official language of India alongside English.
2. "Hindu" in a shortened form: This is less common, but in some contexts, "Hindi" can be a shortened version of "Hindu," referring to someone who practices Hinduism. However, this usage is considered inaccurate and potentially offensive, as it can be interpreted as conflating the language with religion.
It's important to be mindful of the context and avoid using "Hindi" to refer to Hindus unless you are certain that it is understood in that way and will not cause offense.