on Jane Friedman site:

No matter what genre you write in, suspense and tension are the propulsive forces that draw readers through your story. The terms are often used interchangeably, and while they work in tandem, they fulfill different functions.

Suspense creates questions in the audience’s mind—and it’s the engine of every “unputdownable” story.
The fuel that powers it is tension—creating conflict, obstacles, friction—and it belongs on every single page.

In the basic “boy-meets-girl” story trope, suspense is whether or not boy gets girl; tension is everything that stands in the way of the resolution of those questions: the missed call, the argument, the parental disapproval.

Harness them both in your story, and you’ll grab your reader from page one and hold them all the way through to “the end.”