important missense mutations are different than silent and nonsense mutations. Missense mutations have a change in amino acid sequence while silent mutations don't have an affect on the amino acid made. Nonsense mutations are when the codon codes for the stop codon rather than the amino acid that is supposed to be there.

I remember learning in my old biology classes that there are different types of mutations that can occur. There are frameshift and point mutations. A couple examples of frameshift mutations are insertions or deletions.