Verb: When "assume" is used as a verb, it means to take something for granted or to suppose something without proof.
* Example: "I assume you're coming to the party."
Noun: When "assume" is used as a noun, it refers to a thing that is taken for granted or supposed to be true, often without proof.
* Example: "The company's success is based on a lot of assumes."
It's important to pay attention to the context to determine which part of speech "assume" is acting as.