Concept:
Correct spelling is essential in English. Many words are commonly misspelled due to incorrect placement or omission of letters.
Step 1: Examine each option.
- Vacum $\rightarrow$ Missing a letter (incorrect)
- Vaccum $\rightarrow$ Extra letter (incorrect)
- Vacuum $\rightarrow$ Correct spelling (correct)
- Vacume $\rightarrow$ Incorrect ending (incorrect)
Step 2: Identify the correct spelling.
The correct spelling is "Vacuum".