different between barrelful vs barrelsful

English

barrel +? -ful

barrelful (plural barrelfuls or barrelsful)

As much as a barrel will hold.
A large amount.
- 1952, Kiplinger's Personal Finance (volume 6, number 8, August 1952, page 32)
  Chlorophyl is showing up by the barrelful in beauty lotions, tooth pastes, soaps, chewing gum, mouthwashes, antihalitosis tablets, tobacco and dog food.

barrelsful

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