1. Noun: When "lots" refers to a large quantity or number of something, it acts as a noun.
* Example: "There are lots of people at the party."
2. Pronoun: When "lots" replaces a noun phrase, it functions as a pronoun.
* Example: "I have lots of homework." (Here, "lots" stands in for "a large amount of homework").
3. Adjective: While less common, "lots" can be used as an adjective when modifying a noun.
* Example: "There are lots of cars on the road."
Important Note: The use of "lots" as an adjective is not always grammatically correct and can sound informal. "Many" or "a lot of" are often more appropriate alternatives.