It’s a very satisfying thing to learn that there’s a word for an experience you didn’t know could be described by a word. Learning that, for example, clinomania is an “excessive desire to stay in bed” ...
Word meanings can shift radically, just like pronunciation. Called semantic change, a shift in a word's meaning occurs when frequent misuse becomes standard, or when metaphoric use becomes literal.
Thanks to the evolution of language, technology, and lots of hyperbole, these words used to convey a lot more merit, emotion, or simply seriousness than they do nowadays. Ah, “genius.” Once reserved ...