| Term | Definition |
| -o | masculine |
| -a | feminine |
| día | masculine |
| mapa | masculine |
| tranvía | masculine |
| panda | masculine |
| mediodía | masculine |
| idioma | masculine |
| planeta | masculine |
| clima | masculine |
| problema | masculine |
| programa | masculine |
| sistema | masculine |
| poema | masculine |
| mano | feminine |
| radio | feminine |
| foto | feminine |
| moto | feminine |
| lápiz | masculine |
| papel | masculine |
| arroz | masculine |
| aceite | masculine |
| examen | masculine |
| buzón | masculine |
| cobre | masculine |
| disfraz | masculine |
| jarabe | masculine |
| desván | masculine |
| alfiler | masculine |
| cine | masculine |
| clase | feminine |
| gente | feminine |
| llave | feminine |
| torre | feminine |
| piel | feminine |
| luz | feminine |
| -dad | feminine |
| -tad | feminine |
| -tud | feminine |
| -umbre | feminine |
| -ión | feminine |
| -ie | feminine |
| -cia | feminine |
| -ez | feminine |
| -eza | feminine |
| -nza | feminine |
| -sis | feminine |
| -itis | feminine |
| -or/-és/-ón/-ín masculine -> feminine | drop accent mark |
| -aje | masculine |
| -ambre | masculine |
| -or | masculine |
| -án | masculine |
| stressed vowel | masculine |
| days of the week | masculine |
| el capital | money |
| la capital | capital city |
| el mañana | tomorrow |
| la mañana | morning |
| el frente | front |
| la frente | forehead |
| el orden | tidiness |
| la orden | command |
| el policía | policeman |
| la policía | policewoman, police force |
| arte | masculine in single, feminine in plural |
| English words | masculine |
| la cámara | camera |
| el cámara | cameraman |
| la trompeta | trumpet |
| el trompeta | turmpet player |
| months of the year | masculine |
| names of languages | masculine |
| compound nouns that consist of a verb and noun | masculine |
| numbers | masculine |
| colors | masculine (when used as nouns) |
| trees | masculine |
| fruit | feminine |
| infinitives used as nouns | smoking |
| nouns that begins with a stressed a or ha | feminine with masculine article in singular but feminine in plural |
| rivers, oceans, seas | masculine |