Yes, phoenixes is a Scrabble word!

Noun

1. The state capital and largest city located in south central Arizona; situated in a former desert that has become a prosperous agricultural area thanks to irrigation
2. A large monocotyledonous genus of pinnate-leaved palms found in Asia and Africa
3. A legendary Arabian bird said to periodically burn itself to death and emerge from the ashes as a new phoenix; according to most versions only one phoenix lived at a time and it renewed itself every 500 years
4. A constellation in the southern hemisphere near Tucana and Sculptor