grader / grater / greater [ˈgrɛɪdɜr]
grader – n. – a person hired to evaluate produce, exams etc.; 2. a person or machine used to make surfaces smoother; 3. a machine that sorts different sizes of objects such as eggs
grater – n. – 1. a culinary tool used for rasping fruits, vegetables, hard cheeses and spices; 2. a scraper; 3. a person who wears down others especially through their speech or difficult behaviour
greater – adj. comparative form of great – larger, more prominent, more significant or important, older