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I'm coding a decryption service and wondering which is the best name, Decryptor or Decrypter I had a quick look online and it appears -er and -or convert a verb to an agent noun, however is one preferable over the other?

Interestingly my Mac tells me to use the latter.

marked as duplicate by Janus Bahs Jacquet, choster, Davo, Chappo, Neeku Apr 26 at 16:50

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Based on the comments, especially the references from @choster I think it's fair to say neither are wrong per se; however Decrypter seems to be the slightly better option because it's the more common form (especially in Great Britain), and in my case it's a tool rather than a person doing the decrypting.

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Both seem to be in use (looking at documentation for various tools online). According to Google Ngrams "-or" is very slightly more popular. Although only "-er" occurs in the British English sources. I'm not sure how much Google Ngrams can be trusted for the, though.

I would choose one and stick with it consistently.

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