\fbox{%
\makebox[\textwidth]{
\randomword{common}%
\randomword{factor}%
\randomword{difference}%
\randomword{of two squares}%
\randomword{monic}%
\randomword{non-monic}%
\randomword{quadratic}%
\randomword{perfect square}%
\randomword{factorisation}%
\randomword{expansion}%
}
}