Words for things that are neither male nor female are called neuter nouns.
Here are some neuter nouns.
1. The host and the hostess welcomed their guests.
2. The steward and the stewardess look after the passengers on the plane.
3. My uncle and aunt lived in Nebraska.
4. The king and the queen had two children, a boy and a daughter.
5. The prince was eight and the princess was five.
6. Ladies and gentlemen, welcome to our party this evening.