A person who uses a harpoon, especially to hunt whales(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "harpooner" in a sentence
"I knew again only that I was very thirsty, and before my swimming eyes, in mid-air and close up, dangled the sanded tongue of the harpooner."
"There was a giant harpooner in the circle, whose singing was like the bellowing of bulls; and, gazing on him in amazement while he roared some song of the sea, when next I looked across the circle to Anapuni, Anapuni was gone."
"Scotty and the harpooner and with the oyster pirates -- because it was an act that men performed with whom I wanted to behave as a man."