Nouns
A noun is a word for a person, place, or thing. Everything we can see or talk about is represented by a word which names it. That "naming word" is called a noun.
Here are some more examples:
soldier - Alan - cousin - Frenchman (< names for people)
rat - zebra - lion - aardvark (< names for animals)
house - London - factory - shelter (< names for places)