What is it called when the same melody is played by two different voices but not starting at the same time and on a different pitch?

Question

Complete the following sentence:

The 1st violin ______ the 2nd violin at the start of the extract.

Answer 1

You could say it's imitation:

In music, imitation is the repetition of a melody in a polyphonic texture shortly after its first appearance in a different voice.

Wikipedia uses this example from Bartok's Mikrokosmos, which is similar to yours:

Also, this example from Bach's Fugue no. 16:

The 1st violin imitates the 2nd violin at the start of the extract.

Answer 2

"Imitates" is probably best, but another option would be "follows".

The initial melody is called the leader (or dux), while the imitative melody, which is played in a different voice, is called the follower (or comes).

From https://en.wikipedia.org/wiki/Canon_(music)