Yes, bloom is a Scrabble word!

Verb

1. Produce or yield flowers

Noun

1. The organic process of bearing flowers

2. Reproductive organ of angiosperm plants especially one having showy or colorful parts

3. The best time of youth

4. A rosy color (especially in the cheeks) taken as a sign of good health

5. The period of greatest prosperity or productivity

6. A powdery deposit on a surface