Asymptotic notation

For the functions, $n^k$n, start superscript, k, end superscript and $c^n$c, start superscript, n, end superscript, what is the asymptotic relationship between these functions?

Assume that $k \geq 1$k, is greater than or equal to, 1 and $c > 1$c, is greater than, 1 are constants.