different between boastful vs boatful

English

From Middle English bostful, equivalent to boast +? -ful.

boastful (comparative more boastful, superlative most boastful)

Tending to boast or brag.
- 1839, Charles Darwin, The Voyage of the Beagle
  It makes one's blood boil, yet heart tremble, to think that we Englishmen and our American descendants, with their boastful cry of liberty, have been and are so guilty
He wrote a boastful autobiography, recording all his great deeds.

From Middle English botefull, botfull, equivalent to boat +? -ful.

boatful (plural boatfuls or boatsful)

Enough of something to fill a boat, or a boat filled with the thing in question
The city consumes boatfuls of fish every day.

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