"(I know - old school niave etc etc).
So whenever I use Pages or Textedit with the smallest of typos ie: 'wich' when I click on it -
I get the "Look up "wich". "
"wich" could be a misspelling of several words.
My immediate thought was 'which', but it could have been 'witch', 'winch', 'rich', 'with' or 'wick', all of which are only one changes letter or one missing letter away from what was typed.
Pages, when set to 'Check spelling while typing,' did flag it as a misspelled word (or, more accurately, did flag it as a 'word' that was not in the spelling dictionary for the language set in Preferences. A right click on the misspelled word did bring up "Lookup wich" at the bottom of a list of of possible intended words:

When set to 'Correct spelling automatically,' the spillchucker replaced "wich" with the first item on that list. Great, if your error was to type a c where you intended to type a t; not too great if your intended word was any of the others on the list, and now had an unflagged, and thus less noticeable wrong word in place of one that was misspelled, but was marked with a red underscore, which is why I leave that option unchecked.
Considering the topic of your post, I was surprised that you had not corrected the spelling error in your parenthetical remark quoted at the beginning of this post, and by your use of i.e. (Latin: id est, English: that is) in place of e.g. (Latin: exempli gratia, English: for example).
Regards,
Barry