Do the words frequent and frequency have anything in common?

Yes, the words "frequent" and "frequency" are closely related. Here's how:

* "Frequent" is an adjective that describes something that happens often or repeatedly.

* "Frequency" is a noun that refers to the rate at which something occurs or is repeated.

In essence, "frequency" is the noun form of "frequent." They both relate to the idea of how often something happens.

Here are some examples:

* Frequent: "He is a frequent visitor to the library."

* Frequency: "The frequency of his visits increased after he got a new library card."