A noun is the name of a person, place or thing. The "thing" need not be concrete: for example, it can be a thought, an activity, or a principle.

In Modern English, nouns have only a few inflections. The plural is usually made by adding -s, and a possessive is made by adding -'s. These inflections come to us from Old English. But Old English had many more inflections than Modern English has, for nouns were marked in these categories:

The number of different inflections can cause difficulty as you come to terms with (for example) the dozen or so ways of making a plural. The best way to cope is to look for resemblances between Old English and Modern English inflections and to look for redundancies within the inflectional system.