New Delhi, July 6 -- AVALANCHE.

The seven letters are C (center, required), A, V, L, N, H, E. Every valid word must contain C, may use any of the remaining six letters, and can reuse letters as many times as needed.

AVALANCHE is the longest answer in today's set and earns bonus points as a pangram - it uses all seven letters. The word refers to a mass of snow, ice, or rock sliding rapidly down a mountain, though it also functions colloquially for any sudden overwhelming surge of things arriving at once.

Hints before the full list: today's set rewards solvers who think through double-letter patterns. Several words repeat letters from the available set - CANCAN, CALLA, CANNA, LEECH, and CLENCH all contain repeated consonants or vowels th...