This is very cool. I looked up words that have always tripped me up, including banal, brood, indefatigable, preternatural, conch, niche. Indefatigable, banal, and conch had some conflicting ones but the "correct" one occurred enough times that I got the idea. ("Brood" probably isn't commonly mispronounced, I just got it mixed up early in life and never quite got it sorted it out. :) The results for "niche" are consis…
Banal was pronounced like anal, but people got embarassed sometime in the 20th century and started starting saying canal. I like anal.
Variations of indefatigable and preternatural are probably from people who have read it but never heard it pronounced (a. The funny/common example is hyperbole/hyperbolic. It's the stress that is most butchered, which cascades into vowels being pronounced differently. Heurstics in this matter can be internalized and improved.
Niche is one possible outcome of anglicization, which is complex and has different results, mostly depending on how common the word ends up. The more foreign-like (French) is neesh. The more anglicized is nich. Neither are worthy of ridicule (which usually comes from the ignorant, and is another topic altogether). Just avoid mixing the two: Never "neech" (like Nietchze) or "nish", which will make me laugh.