Yes, built is a Scrabble word!

Adjective

1. (used of soaps or cleaning agents) having a substance (an abrasive or filler) added to increase effectiveness

Verb

1. Make by combining materials and parts

2. Form or accumulate steadily

3. Build or establish something abstract

4. Improve the cleansing action of

5. Order, supervise, or finance the construction of

6. Give form to, according to a plan

7. Be engaged in building

8. Found or ground

9. Bolster or strengthen

10. Develop and grow