As I have mentioned en passant a few times -
His book was a rip-off of the seminal, earlier work (1935) by Stuart Chase, The Tyranny of Words. Chase also wrote, The Power of Words.
While you can't copyright an idea - one is expected at least to give attribution. SIH's smarmy self promotion long into his dotage, never credited the author of the thesis of his 'work'.
(He was a 'local', too - taught at SF State. I never got around to twitting the guy; no excuse. Massively full-of-Himself I deemed him.)
Yes, he embroidered and added material, but never IMhO was his opus as clear as Chase's - who focussed upon the [referent] for words, and how confusion about that (re each word chosen) is the root cause of all miscommunication. Chase also wrote for a child's comprehension level - obv clearly enough that Hayakawa Got It too.
Read both.
moi
Edit: sp. [twice!] and:
Chase introduced the idea of substituting blab wherever hi-falutin Words like Liberty, Truth, Goodness were being employed -- using political speeches as candidates. Were children exposed early to his (akshully quite Fun) book, there would be far less attention paid to the radio-demagogues - and far more laughter directed to the hoary fulminations of senile Senators.
But.. they aren't (exposed), the Nintendo Eloi.