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There's probably a word I've been pronouncing wrong my whole life that I don't know about
(discuss.tchncs.de)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
A "niche" is not a "nitch"
You're a bit too late for trying to complain about that one.
The latter has been the dominant American pronunciation of the word for so long that it now appears as the primary pronunciation guide in American dictionaries.
Both Oxford English Dictionary and Merriam-Webster agree that "nitch" was the correct pronunciation in both British and American English until very recently. You already linked Merriam-Webster, so here's O.E.D:
(N.E.D is the original name of the O.E.D. "/nɪtʃ/" is pronounced "nitch" and /niːʃ/ is pronounced "neesh".)