User:Quercus solaris/Words for something being where it shouldn't be, with a lexical gap where a sense could be but isn't

With ectopia, ectopy, heterotopia, dystopia, and malposition, we've got plenty of words for something being where it shouldn't be. An ectopic tissue, organ, or pregnancy is out of place, literally. In atopy (atopic hypersensitivity, atopic hyperreactivity), atopic reactions and atopic dermatitis occur, and atopy was named thus because it's out of place, figuratively (that is, inappropriate). Now, if you can call an inflammatory reaction atopic because it's out of place, and you can refer to it as an instance of atopy, one might think that atopic could have a sense in which it's synonymous with ectopic. Even if not everyone used it, one might expect it to exist, to be attested, and to be entered in at least one or two dictionaries. But I had to check quite a few before I found one, and only one, that lists it. And it labels that alternative sense as "dated". Clearly, no one currently uses the word that way, and hardly anyone ever did. Which strikes me as something of a lexical gap. Thus these are words for something being where it shouldn't be, with a lexical gap where a sense could be but isn't.