Rules of Noun Gender 1. Nouns ending in O are masculine. 2. Nouns ending in A are feminine. 3. Nouns ending in r or l are usually masculine. 4. Nouns referring to males are masculine. 5. Nouns referring to females are feminine. 6. Nouns ending in -ad, -ción and -sión are feminine. 7. Nouns ending in E or a consonant may be either masculine or feminine unless referring to either a male or female. 8. Noun is irregular and does not follow any assigned rule.