American Heritage Dictionary
(2)
Century Dictionary
(3)
GNU Webster's 1913
(1)
WordNet
(2)
Elsewhere on the web
But if a word ends in a sibilant, it is acceptable (especially in journalism) to use a final apostrophe without the additional s {Bill Gates 'testimony}.— RealClimate
These sibilant-free sissies all curl around Drew to hear her latest dating woes, greeting each sad revelation with a different gay cliché rejoinder: "Oh, girl!"— Queerty

American Heritage Dictionary (1)
Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about once a year.
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