I'm working on my book right now, and have to write some text as well :-). My most frequent error is typing some initial characters and trying to autocomplete them with ctrl+space. ...and word silently ignores that. Such a plugin would be a killer feature for every netbeans, and even eclipse developer. It should be doable. Word has to maintain internal database for spellchecking anyway. This could be a killer feature of e.g. OpenOffice :-).
Web Apps, SPA, PWA with vanilla Java Script (ES 6+), CSS 3 and WebStandards only. As simple as possible, but not simpler. See you at: (Progressive) Web apps, Single Page Apps and WebStandards airhacks workshops at MUC airport, Winter Edition
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