Relationship between Anonymity and Untraceability

Anonymity means that nobody knows your real identity on the internet.

Untraceability means that nobody is able to trace back your actions to you.

It appears to me that Anonymity and Untraceability is the same thing as if nobody knows my real identity on the internet , how are other users going to trace my action to me. Similarly , if no one can trace my actions to me , I am considered to be anonymous.

I am unsure if my line of argument is correct and how to define the relationship between Anonymity and Untraceability

What is the relationship between Anonymity and Untraceability and how are they different ??