From "bas" meaning "low":
* abase: to lower in rank, dignity, or esteem
* basement: the lowest floor of a building
* base: the lowest part of something
* debase: to lower in quality or value
* abasement: the act of lowering or being lowered in rank, dignity, or esteem
* debasement: the act of lowering in quality or value
From "bas" meaning "base":
* basis: the foundation or underlying principle of something
* basic: fundamental or essential
* basal: relating to or situated at the base
* baseless: without a foundation or justification
* abase: to lower in rank, dignity, or esteem (also can relate to "low")
Other words with "bas":
* basal ganglia: a group of nuclei in the brain involved in motor control
* basal metabolic rate: the rate at which your body uses energy when you are at rest
* bass: a low-pitched voice or instrument
Note: There are also some words with "bas" that don't come from this Latin root, like "baseball" and "basketball."