Knop is a rarely used word that refers to a small rounded button or knob. If you are looking for synonyms for this word, some alternative options include knob, button, cap, boss, bead, bud, pommel, top, ball, or handle. While most of these synonyms are similar in meaning to knop, some of them are used more commonly in everyday language, such as knob and button. Others, such as cap and boss, are often used in specific contexts, such as in architectural or design discussions. Regardless of the context, these synonyms are useful alternatives that can help to add variety and specificity to your vocabulary.