Both “acknowledgements” and “acknowledgments” are correct spellings of the same word. The version with “e” (acknowledgements) is standard in British ...

Neighbor and neighbour have the same meaning. The only difference is spelling. Neighbor is the American English form, while neighbour ...

Both “misspelt” and “misspelled” are correct spellings of the past tense of misspell. Misspelled is the preferred spelling in American ...

Both grey and gray are correct. Gray is the preferred spelling in American English, while grey is the standard spelling ...

 Both “flautist” and “flutist” are correct. “Flutist” is standard in American English, while “flautist” is more common in British English ...