Spanish Grammar/Masculine and feminine endings, guidelines

In Spanish, all nouns are either masculine or feminine. Masculine nouns ultilize the singular article el, and the plural article los. Feminine articles utilize the singular article la and the plural article las.

Nouns ending in -o are usually masculine. Nouns ending in -a are usually feminine.

Masculine Endings
Nouns that end in -o, -ma, -pa, -ta, -l, -n, s, -aje, or an accented vowel are usually male.

–ma, -pa, or –ta

–l, -n, -r, and singular nouns that end in -s

-aje

Ending in an accented vowel