Here's how it works:
* Lively: This is an adjective, describing something that is full of energy, activity, and excitement.
* Liveliness: This is the abstract noun, representing the quality or state of being lively.
For example:
* "The party was full of liveliness." (Describing the quality of the party)
* "The children's liveliness was contagious." (Describing the children's state of being)