There is a word in fiction so ordinary that readers skip right past it. They see it a hundred times in a chapter and register it exactly zero times. That word is said.
This invisibility is not a flaw. It is the whole point.
Consider the difference between these two lines:
"You were never coming back," she said.
"You were never coming back," she breathed accusatorially.
The first line delivers emotion through the words themselves and through the reader's imagination. The second line delivers stage direction. It tells you how to feel rather than letting you feel it. The dialogue tag has stepped in front of the scene and started explaining the scene, which is exactly what a dialogue tag should never do.
The invisible word principle
Good prose infrastructure disappears. A well-placed chapter break, a cleanly turned paragraph, a confident period where a lesser writer would have used a semicolon - none of these call attention to themselves. They do their job and get out of the way.
"Said" works the same way. It is a hinge, a mechanical joint in the sentence. The reader's eye passes over it without friction. Any other verb introduces friction. Exclaimed asks the reader to adjust their register. Retorted tells them what tone to apply. Opined - well, nobody should be using opined unless they are writing satire.
Elmore Leonard put it cleanly in his ten rules of writing: "Never use a verb other than 'said' to carry dialogue." He made one exception - asked, for questions. That's it. Two verbs for the entire human range of spoken expression.
The counterargument is obvious: doesn't that get repetitive? The answer is no, because "said" does not register. You cannot get tired of a word you do not notice. What gets repetitive is exclaimed every four lines, because you do notice it, every time.
What the verb is actually for
The dialogue tag's job is attribution - to tell you who spoke. Nothing more. If you need the reader to know that a line was whispered, you can write the information into the scene itself:
"You were never coming back," she said. She kept her voice low. The door was still open.
Now the reader knows the line was nearly a whisper, and they built that image themselves from the physical detail. That is far more powerful than the word whispered would have been, because the reader has participated in constructing the moment.
How Bindery's dialogue analysis uses this
When you run a dialogue tag check in Bindery, the tool is not hunting for "bad" words. It is looking for density. One murmured in ten thousand words is fine - it may be the single moment where the sound quality of the speaking actually matters to the plot. Ten murmureds in a single chapter is a different problem.
The check surfaces the count and highlights each instance in context. Then you decide. That is how it should work: the tool shows you what you wrote. You bring the judgment. "Said" will almost always be the better choice, but knowing that is only useful if you can see the cases where you reached for something else.
The lesson is not that said is the correct word. The lesson is that the best dialogue tag is the one your reader forgets the moment they read it.