A noun is more than just a person (friend) or place (school) or thing (book).
It can be a process (sequence) or activity (studying) or condition (joy).
Terms to know:
Concrete nouns are solid and real and perceptible (chair, desk, room)
Abstract nouns cannot be perceived by the senses (feeling, sadness, pain).
Collective nouns involve a group or collection of people or things (team, committee, group).
Proper nouns refer to the name of a specific person, place or thing (Jon, the US, Skype).
Mass nouns are uncountable (water, evidence, luggage).
What is your favorite noun?