Like spell checker, only it asks if that’s really the word you want to use.
I’ve been reading free ebooks, and them using the wrong wording is just getting in the way of my appreciation of the glaring plot holes. 
Since this sounds like something I could write, I want to make sure it isn’t already out there.
Latest example - the author used mignons instead if minions. Unless evil vampires have a cadre of french cuties?
There’s obviously a lot at steak in that book.
an editor ?
Thank you so much. Everyone needs an editor, but practically no one ever hires one anymore.
Their sew expansive!
Sizing & bolding mine.
It seems you need this new app.
A grammar checker would cover a lot of it, although I am sure there are numerous cases where you could substitute words that sound the same in a sentence and still have it make sense.
I notice those sort of errors in ebooks from time to time, but particularly in older books (30-40 year old ones). Would those older books be scanned in? Retyping them would be a huge job, I would think. Might it be a problem with the text recognition of the scanning process? I see things like “ni” when it should be “m” (or vice versa).
Gaudere’s rule strikes again!
I re-read mine over a dozen times trying to avoid that. And also made it as succinct as possible. 
Yes: “checker.”
Proofreaders and copyeditors do this professionally for real books.
I was going to say “gingham”!
Microsoft Word has a grammer checker but I often ignored it. It kept complaining about passive voice and even after I read about passive voice I didn’t understand it.
Bob
Other than a dictionary?
Plaid.
I often dictate using Dragon Naturally Speaking instead of typing. To work at all it has to be pretty good at determining which word you want to write, taking your accent and normal style into account.
I wonder if that engine could be adapted for typewritten text?
It does have an auto feature for punctuation, but that is totally pants.
For the last couple of years, Word has put a blue squiggly line under words its thinks might not be correct. But it only picks up mistakes some of the time. It corrects me if I type “here” instead of “her”, but not if I type “though” instead of “thought”.