Self-centred

10!/2!2! total no of arranging 10 words=10! we divide by 2!2! because two letters viz u and a occur twice

There are a total of 10 letters out of which u and a are the letters which are repeated twice.

Therefore we have to divide those two extra cases from the total number of cases which is 10!

So we need to evaluate $\frac{10!}{2!2!}$ which is $\boxed{907200}$