Scrum is a popular Agile process, so why not use its terminology?

First, there are plain English words that already mean the same things. “Iteration” is a perfectly fine word and is actually closer to the intended meaning than “sprint.”

Second, Scrum terminology directly contradicts the stated principles of Agile development. For example:
Agile processes promote sustainable development…[The team] should…maintain a constant pace indefinitely.
Contrast this with the term “sprint,” which suggests a short burst, an unsustainable pace.

Third, the Scrum terminology creates a negative frame of reference. For example, you can be on the first day of a project and have a “backlog.” “Sprints” and “spikes” suggest a state of permanent and meaningless urgency.