Center words between hypen

I have to center '-' mark in each line and it should be in the same location of each line. How would I do that?

\begin{flushleft}        
    $I(b)$ - interrogating signal\\
    $h_n$ -forward ross     \\
    $h_f$ - reversequite      \\
    $h$ - product ofall and wox\\
    $F_h(t)$ - interrrr        \\
    $S_m(b)$ - $m^{th}$ reponse of x thererer       \\
    $b(t)$ - received signal\\        
    $\omega(x)$ - noise added omega read         
 \end{flushleft}

I have used \tab{} and \align{} but I don't get reults what I want.