I get a kick out of how many satisfying words can stand in for 'turmoil' on a crossword — it's like watching a tiny drama play out in five or six letters. For quick, common fills I reach for 'chaos' (5), 'havoc' (5), 'mess' (4), or the jaunty little 'ado' (3) if the clue leans toward fuss. If the puzzle wants something a bit meatier, 'tumult' (6), 'bedlam' (6), 'mayhem' (6), and 'upheaval' (8) are classic choices. 'Pandemonium' and 'maelstrom' are glorious if the grid has the space and the constructor wants something theatrical.
I also watch the voice of the clue. If it's formal or literary, 'turmoil' might be best matched by 'tumult' or 'upheaval.' If it's cheeky or conversational, editors love 'ado' or 'mess.' And in cryptic-style settings, remember that the word 'turmoil' frequently acts as an anagram indicator — so it might not be the definition at all but a hint to shuffle nearby letters. That little trick has saved me on more than one Saturday puzzle.
Whenever letter patterns are stubborn, I cross-check vowel placements and consider regional flavor: 'hubbub' (6) appears often in British-style puzzles, while American crosswords favor 'chaos' and 'havoc.' I enjoy the little mental pivot when a six-letter slot becomes 'tumult' instead of 'mayhem' because of a single crossing — tiny victories that keep me grinning long after coffee cools.