Here are some examples:
* "The students took a test on their grammar skills." (Here, "test" refers to an assessment)
* "The doctor ordered a blood test." (Here, "test" refers to a medical procedure)
However, "test" can also be a verb:
* "I tested the water temperature before getting in the pool." (Here, "test" refers to the action of checking something)
So, it depends on the context!