Call me ___ (old joke setup), 4 letters
Hail ___ (cry Taxi!), 4 letters
Hail ___ (flag down a taxi), 4 letters
Hail ___ (wave from the sidewalk), 4 letters
Okay, you're ___ (taxi joke punch line), 4 letters
Okay, you're ___(punch line), 4 letters
Something to hail or call, 4 letters