Most nouns that end in -A are feminine. Here are some examples:
* la casa (the house)
* la mesa (the table)
* la ventana (the window)
* la puerta (the door)
* la cama (the bed)
Words that end in -IÓN
Nouns that end in -IÓN are also feminine. Here are some examples:
* la información (the information)
* la educación (the education)
* la investigación (the investigation)
* la opinión (the opinion)
* la solución (the solution)
Words that end in -DAD
Nouns that end in -DAD are also feminine. Here are some examples:
* la ciudad (the city)
* la libertad (the freedom)
* la igualdad (the equality)
* la universidad (the university)
* la sociedad (the society)
Words that end in -Z
Some nouns that end in -Z are also feminine. Here are some examples:
* la luz (the light)
* la voz (the voice)
* la cruz (the cross)
* la vez (the time)
* la nariz (the nose)
There are some exceptions to these rules. For example, the word "el día" (the day) is masculine, even though it ends in -A.