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Traditional English usage adds to the confusion of bolt vs screw. Machine screw and lag bolt are common words among technicians, carpenters, and ordinary people, but each is actually the opposite of what the name suggest:

- A "machine screw" is a bolt (i.e., it needs a nut):

https://encrypted.google.com/search?q=machine+screw&tbm=isch

- A "lag bolt" is a screw (i.e., it doesn't take a nut):

https://encrypted.google.com/search?q=lag+bolt&tbm=isch

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I wouldn't say that there's 'confusion' - just that the terms are actually far looser than the linked document would suggest, because many fasteners can be bolts or screws depending on how they are used.

I would say that machine screws are usually used as screws. Machine screws are generally driven with a Phillips/Posidriv or flathead driver into threaded holes, so don't necessarily need a nut, but you can use them as bolts with a nut also. You use a spanner to drive lag bolts and they generally have hex heads like bolts so I would call them bolts, but technically they are actually screws.

And a Square Knot is actually a bend. A knot is tied in the end of a rope; a bend fastens two ropes together.

Only if you're doing it wrong.

https://en.wikipedia.org/wiki/Reef_knot#Misuse_as_a_bend

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