[Par71]

So component 10-15-b is classified as hip ACTION, why then would he use this verbiage in 10-15-b "use this hip TURN to prevent overswinging" why would he use the word turn and not action when he specifically differentiated the two components

With Delayed Hip Action, "Hip Action is delayed until Start Down". So the Action of the Hips cannot be responsible for preventing overswinging on the backstroke. I think Homer is referring to the first sentence of 10-15-B where he explains that the Shoulders lead and power (or at least lead) the Backstroke Hip Turn. In other words, a Backstroke Hip Turn that is lead by the Shoulders (rather than the other way round) prevents overswinging.

He wrote "Hip Turn" in that sentence you quoted in every edition from the first to the seventh. So I assume it's intentional.