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"whichever" is also used as a crossword clue. If that's what you saw, the answer is often any (3 letters).
Definitions
Any one of a set, no matter which.
Word origin
From Middle English qwichever, whiche ever, whiche evere, which ever, which evere; equivalent to which + ever.
Used in a sentence
“Good heavens! Whichever button did you press to make that happen?!”
“It won't work, whichever buttons you press.”
“Whichever book you borrow, be sure to return it to the library on time.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Any one that”9 letters
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