From 'Sneak Peek' to Mountain 'Peaks': Real-World Visual Guide to Usage
No vocabulary guide covering this pair is complete without addressing the third, frequently confused interloper: "pique." Borrowed directly from the French verb piquer (meaning "to prick" or "to sting"), the word entered modern English carrying an element of sharp stimulation.
When something pricks your interest, it provokes your senses. That sharp prick explains why standard grammar rules demand "pique curiosity" rather than "peak curiosity." Writers often assume that because their curiosity has reached a high level, the summit form must apply. This is a common spelling mistake. Curiosity is stimulated, not elevated like a topographical formation.
"Pique" also operates as a noun describing wounded pride or resentment, as seen in the phrase "a fit of pique." If a board member resigns after being passed over for a promotion, they act out of pique. Substituting either "peek" or "peak" in that context strips the sentence of its historical emotional nuance.