What a buried verb costs
The committee made a decision to postpone the review. Nine words to say what the committee postponed the review says in five. The verb that carried the meaning — decide — has been packed into a noun, and made has been brought in to hold the sentence together while carrying nothing at all.
Doing this once is invisible. Doing it in every third sentence produces prose that feels heavy without any individual sentence being wrong, and it is one of the harder habits to see in your own draft, because each instance looks fine as you write it.
When the noun is the right choice
Often. If the process itself is your subject — comparing two methods of assessment, arguing that a classification is unstable — then naming it as a noun is precise, and the verb form would force you into a clumsier sentence. Writing guidance that treats every nominalization as an error is giving you a rule where it should be giving you a question: is this noun the thing I am talking about, or is it a verb I have flattened?
That is why this tool suggests rather than corrects, and why nothing here produces a score you can chase. The glossary entry for nominalization works through three sentences in detail, including one that is better left alone.
The habit it most often travels with is passive voice, and the two compound each other: “a decision was made” buries the verb and removes the person who made it in the same four words. They are separate mechanisms and separately fixable, which is why this tool does not flag passives — the reliable test for those is a sentence you can apply yourself, and that page has it.
Where it sits alongside the other tools
This one looks at grammar — a construction, not a vocabulary list. If you want the opposite angle, the AI word finder flags stock terms wherever they appear, and the sentence opener checker looks at how your sentences begin. For overall difficulty rather than any specific habit, the readability checker gives you a grade level with its working shown.
None of them is a detector and none of them predicts one. If that is the actual worry, how detectors work is the honest starting point, and stylometry covers what measuring style can and cannot establish about who wrote something.