I entered this thread assuming the OP was unable to taste nuts - e.g., allergy issues. Since that doesn’t seem to be the case, I wonder how they could ask… what the point of asking to have a common flavor described is. Um… go taste a few nuts, perhaps? There is a commonality to their flavors that should answer the question.
For those with allergies who may not know the taste and can’t experiment directly, toast some white bread and spread a little browned butter on it. That’s pretty close to a general “nutty” flavor.