Open English Wordnet
Nouns
(n)puzzle, puzzler, mystifier, teasera particularly baffling problem that is said to have a correct solution“he loved to solve chessmate puzzles”,
“that's a real puzzler” (n)puzzlea game that tests your ingenuity Verbs
(v)perplex, vex, stick, get, puzzle, mystify, baffle, beat, pose, bewilder, flummox, stupefy, nonplus, gravel, amaze, dumbfoundbe a mystery or bewildering to“This beats me!”,
“Got me — I don't know the answer!”,
“a vexing problem”,
“This question really stuck me” (v)puzzlebe uncertain about; think about without fully understanding or being able to decide“We puzzled over her sudden departure”