* Variable: Something that can change or vary.
* Variation: A change or difference in something.
* Variety: A number of different things, or the state of having different forms.
* Variant: A form of something that is different from the usual.
* Varied: Different or diverse.
* Vary: To change or differ.
* Variability: The quality of being subject to change.
* Varies: Third-person singular present tense of "vary".
* Varietal: Relating to a variety or varieties.
Please note that some of these words are formed with other prefixes and suffixes, not just "vari" on its own.