Other forms: perfectionists
A perfectionist is someone with very high standards: they want everything to be just right at all times.
You know how perfect things are flawless? A perfectionist wants things to be like that all the time. A writer who is a perfectionist will revise over and over again, trying to get every word just right. A perfectionist boss will be hard on employees who aren't as careful or hard-working. Perfectionists tend to do very good work because of their high standards.