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Big gun

noun

Noun

1
A large artillery gun or one of the largest-caliber naval guns (as on a battleship).
"London, Nov. 1: The big guns opened fire on Paris today at mid-day."
2
an important influential person wordnet
3
A person, group, thing, or course of action that is powerful, influential, or particularly effective. broadly, idiomatic, in-plural
"This has been a great day for the big guns. This does not refer to Prof. Lummis and the other big guns of the Board of Visitors, for every day is a great one for them."
4
A large surfboard used to ride very large, powerful waves.
"Special boards are used called "big guns.""

Unscramble this word: biggun