different between centerboard vs keelboat

English

From center +? board

centerboard (plural centerboards)

keel +? boat

keelboat (plural keelboats)

(sailing) Any sailboat having a keel (as opposed to a centerboard or daggerboard).
- 1870, Mark Twain, Life on the Mississippi, Chapter 3.
  By and by the steamboat intruded. Then for fifteen or twenty years, these men continued to run their keelboats down-stream, and the steamers did all of the upstream business, the keelboatmen selling their boats in New Orleans, and returning home as deck passengers in the steamers.

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