To solve the question of determining which word does not belong with the others, we need to identify a pattern or category common to three of the options and then identify the one that differs.
The distinction is clear: while Guitar, Violin, and Cello share the characteristic of being string instruments, Flute is different because it is classified as a wind instrument.
Conclusion: The word that does not belong with the others is Flute, as it is the only wind instrument among the options.