Yes, preserve is a Scrabble word!

Verb

1. Keep or maintain in unaltered condition; cause to remain or last

2. Keep in safety and protect from harm, decay, loss, or destruction

3. To keep up and reserve for personal or special use

4. Prevent (food) from rotting

5. Maintain in safety from injury, harm, or danger

6. Keep undisturbed for personal or private use for hunting, shooting, or fishing

Noun

1. A domain that seems to be specially reserved for someone

2. A reservation where animals are protected

3. Fruit preserved by cooking with sugar