川柳【せんりゅう】
senryū, comic haiku, humorous seventeen-mora poem
青柳【あおやぎ】
green willow (i.e. one that has budded), meat of the trough shell (Mactra chinensis)
花柳【かりゅう】
red-light district
花柳界【かりゅうかい】
red-light district, pleasure quarters, world of the geisha, demimonde
柳刃包丁【やなぎばぼうちょう】
kitchen knife for sashimi