What is a possessive noun

In possessives, the placement of the apostrophe depends on whether the noun that shows possession is singular or plural. Generally, if the noun is singular, the apostrophe goes before the s. The witch's broom. If the noun is plural, the apostrophe goes after the s: The witches' brooms. However, if the word is pluralized without an s, the apostrophe comes before the s: He entered the men's room with an armload of children's clothing. If you create a possessive with a phrase like of the witches, you will use no apostrophe: the brooms of the witches.

Prepositions link nouns and a verb or other noun to modify them, e.g. show position or possession. E.g. In: "the book on the shelf, the book from John, the book under the dictionary", propositions on, from and under link book to another word.

The possessive noun is "mayor's". See http://wiki.answers.com/Q/What_is_a_possessive_noun?#slide=1

Possessive Form of a noun.
To express possession one appends an apostrophe followed by s ('s). That is the possessive form of the noun.
The paw of the tiger : the tiger's paw. Tiger's is the possessive form of the noun tiger.
When the noun is a plural ending in s, the possessive form could be ...s's or ...s'. Both forms are correct. If you are a student and your teacher insists on using one form rather than the other, do as you are expected. Once you start writing your own books, use the form that pleases you. It is just a matter of usage, and usage is changing all the time.

There is no such thing as a possessive noun.
The real question should be : What is the possessive form of a noun? How do you show possession (ownership) relating to some noun?
To express possession (ownership) in English one appends an apostrophe (') followed by s. To append is to put at the end.
The nose of the moose can be expressed as the moose's nose.
The rule is straightforward. When the noun to which the ownership refers is in the plural, the rule can be applied as stated above append ('s). However if the mark of the plural is s (regular plural) some people want to use the rule above, some others say that the last s should not be appended..
Example: The hind legs of the wolves can be expressed as the wolves's hind legs or the wolves' hind legs. In the first expression you have wolves's while in the second you have wolves'.
Both rules are correct, but nowadays the tendency is to use the second form. It is a matter of usage.
If you are a student follow what your teacher says. When you write your own books, choose the one you want, but if your editor insists on using the other one, you have a problem.

It should be possessive PRONOUN
A pronoun is a word that can replace a noun. When you use I instead of your name, you are using a pronoun. This is an example of a personal pronoun. When you talk about you and use the word myself, you are using a pronoun. It is an example of a reflexive pronoun.
Possessive pronouns express possession/ownership. Examples are my, mine, your, yours, his, his her, hers, its, their, theirs.

I hope that helps.

a noun that gets jealous if another noun goes nears it's verb.

Inflection is used to indicate a) number, b) case or c) gender in nouns, verbs and other parts of speech. The result is that a word will often become slightly altered, or letters are added to it, in order to show that a shift (in number, case or gender) has taken place.
It is found in many languages of the world, especially common in European languages, including Old English, but less commonly found in Modern English.

Concerning NOUNS

Examples:
a) To indicate number (singular vs plural): goose / geese; ox / oxen; child / children; medium / media; book / books; alumna / alumnae, etc.
Sometimes the form stays the same however: deer / deer; sheep / sheep, etc.

b) To indicate case:
In English: possession or "genitive case": Paul / Paul's (of Paul); dog / dog's (of the dog), etc.
In German: possession or "genitive case": Mann (man) / Mannes (of the man) - Der Hund des Mannes (The man's dog).
Also in words like Tuesday [Tu's Day]; Wednesday [Weden's Day --> Wodan's Day]; Thursday [Thur's Day --> Thor's Day], etc.

c) To indicate gender:
Often found in words borrowed from other languages:
alumnus (male) / alumna (female); alumni (male plural) / alumnae (female plural), etc.
Even in names: Marc / Marcia; Andrew / Andrea; George / Georgia, etc.

I hope this is helpful.
From: 11407336

Kinds of Nouns:

1. Abstract
2. Collective
3. Common
4. Concrete
5. Countable
6. Mass
7. Material
8. Plural
9. Pronoun
10. Proper
11. Singular
12. Uncountable

Classifications of Types of Nouns
Proper Noun: This is used to denote a particular person, place or a thing.
Examples: English is a global language.

Common Noun : This is used to refer to a class.
Examples: The cat loves comfort.

Collective Nouns: This is used to refer to a group or a collection of things.
Examples: I saw a herd of sheep nearby.

Concrete nouns: You can experience this group of nouns with your five senses. These nouns can all be touched, smelt, tasted or seen.
Examples: The cute rabbit hops around.

Countable Nouns: To linguists, these count nouns can occur in both single and plural forms, can be modified by numerals, and can co-occur with quantificational determiners like many, most, more, several, etc.
Examples: There were so many bikes on sale.

Material Nouns : This is used to tell the substance by which the things are made.
Examples: The chair is made of bamboo.

Pronouns: These nouns can take the place of a noun when referring to people places or things. In English the personal pronouns are I, you, he, she, it and they. Depending on their function within a sentence these nouns can take on their possessive forms or their objective case.
Examples: Suzy will let her hair grow longer. possessive personal
He jumped on the bed. singular personal

Abstract Noun: It is used to indicate the quality possessed by a person or thing.
Examples: I appreciate your sincerity.

Uncountable Nouns: These nouns cannot be counted they are often referred to as mass nouns. These nouns cannot be used in a plural form.
Examples: The pool was full of water. The uncountable noun in this sentence is water.
Read more: http://wiki.answers.com/Q/What_are_the_kinds_of_nouns#ixzz1VNQPNpIZ