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The noun is the name of anything that refers to people (Elena), things (la casa / the house), animals (el perro / the dog) and sometimes to qualities (nobleza / noble) and immaterial things perceived only through the senses (esperanza / hope).

The Noun function

The noun functions are:

a) Nucleus of the sentence:          

     La casa es de color amarilla / The house is yellow.

b) Nucleus of appositives:                

     Mi país preferido, México, tiene 32 Estados / My preferred country, México, has 32 States.

c) Direct object (DO) :                       

     Comí arroz en Navidad / I ate rice on Christmas day.

It can also do the work that could be done through other words:

a) They can work  as nucleus of predicates without a verb:

     Casa vieja, problema seguro / Old house, sure problem. 

b) Nucleus of the sentence that describes the way of being or quality of the subject:                         

     Newton es el científico que descubrió la ley de la gravedad / Newton is the scientist who discovered law of gravity.

c) Nucleus of the circumstantial object (CO):

     Alimenté al pájaro el martes / I fed the bird last Tuesday.

Articles and Nouns

  Nouns usually require either a definite article or an indefinite article (el, la, los, las & lo or un, una, unos, unas) before them:


             La casa / the house

             Una casa / a house

         (In this example, casa is the noun and la is the definite article or where casa is the noun and una is the indefinite article).

       el -- un            masc. sing.

       la -- una          fem. sing.

       los -- unos       masc. plural

       las -- unas       fem. plural

       lo -- un            neuter (usually singular)

Noun gender

     All the nouns have a gender (masculine, feminine or neutral). There are some nouns that have an ambiguous gender (el mar, la mar), others can have both genders but will suffer a change of meaning between one and the other (el cura (meaning the priest) - la cura (meaning the cure)).

        There are nouns that do not change gender (la serpiente hembra o macho,- meaning the female or male serpent) and the nouns where the article makes the difference of the gender (la jóven or el jóven).

The gender of a noun can be known using the following conditions:

*This condition works with singular words only.

Some nouns can change gender:

Gender and Quantity

They all have the quantity denoted (singular or plural).
                            La casa / the house (singular)
                      Las casas / the houses (plural)

Pluralizing Nouns

Almost any noun and adjective can be pluralized.
To transform a singular noun or adjective into plural consider the next 3 options:

Noun Possessive Form

The possessive form of a noun such as "Nancy’s house.."  doesn’t exist in Spanish, so the way to express the possessive is:

        "The house of Nancy..." (la casa de Nancy..)  

To pluralize, just pluralize the possessed noun:

        "Las casas de Nancy..."

Derived Nouns

The derived nouns can be formed  and come from a primitive or root word:
*It is important to mention that some of these derivatives are hard to find in regular dictionaries because of their uncommon usage.