I'm not sure why you're being downvoted, this is completely true.
Big Ben is the bell not the clock.
Big Ben is the bell not the clock.
Is the fact that the name originates from a bell, and that the official name for the tower is different, interesting? Maybe. Is it worth “correcting”? No, for the same reason it’s not worth policing people’s use of “Google” to mean “Alphabet”.
I also reject your premise this is anything similar to referring to Google/Alphabet as interchangeable.