variant

noun
  1. A form or version of something that differs in some respect from other forms of the same thing or from a standard. noun
    The new variant of the software includes several bug fixes.
    Scientists are studying a new variant of the virus that has emerged in the region.
  2. Differing from others of the same kind or from a standard. adjective
    The variant spelling of the word is less commonly used.
    The car comes in a variant model with additional features.