There is now a dictionary of many words found in MediaWiki software in our core repository at *maintenance/dictionary/mediawiki.dic* If your IDE supports code/comment spell checking, you can attach it to hide many false errors.
The file is a one-per-line list of words. Please keep it sorted and without duplicates.
If you use JetBrains' *PhpStorm*, go to File/Settings/Spelling, and add the directory (not the file) to the dictionaries tab. Adding new words to dictionary place them into mediawiki.idea\dictionaries\User.xml or sometimes to %userprofile%.WebIde60\config\options\cachedDictionary.xml, so you have to manually copy them to the .dic file, unescape xml &xxx; entries, and sort/remove dupls.