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"merger" is also used as a crossword clue. If that's what you saw, the answer is often amalgamation (12 letters).
Definitions
the combination of two or more commercial companies
Word origin
From merge + -er.
Used in a sentence
“Club mergers reduced the number of teams by half”
“the cot-caught merger”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Company combination”6 letters
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