Looking at Blender 2.79 right now, a comfortable 90% of icons, buttons etc have tooltips with useful (if terse) text. Some buttons are text instead of icons, but that's also true of Word.

I don't doubt Word is more discoverable, partly because of Microsoft's resources and partly because word processing is fundamentally more accessible than 3D modelling. But by the metrics you're talking about, Blender is maybe 75-90% as good. Which I don't think is the same as "discoverability almost doesn't exist".