Pouring anchor Kenter shackle lead plug - GIF

[Toolmaker51]

"Shot" relates loosely as a verb and or adjective, not so much only a noun, as a few other terms in mooring.
When a vessel positions over desired anchorage point, the depth is either known by markings on the nautical chart (map) or a sounding. That depth converts to 'shots' needed to lay anchor and the amount of chain (or anchor line) needed to absorb current and tidal changes to not disturb anchor.
Chain runs fast, scary fast. The 'shots' are counted as they zip by to ascertain the correct length is out, because they are painted a different color. Some even use color coding in alternates, mostly depending on how energetic the crew manning the foc'sle are.

Chain is great anchor line, enough laying in a pile below holds position very well, but current/ wind/ tide cause it to drag, hence the anchor aka hook. Many lighter vessels use line, and roughly one foot of chain per length of boat between it to the anchor, the assembly known as the "rode". A ratio of 3:1 is minimal depth to rode length, up to 7:1 or so. Longer it is, makes the 'rode' a shock absorber, while the chain lays on the bottom. Line is usually marked in 20' 'shots' with a band of paint or electrical tape, etc. 'Tackle' is often used to describe the whole assembly.

Speaking of terms, when the connection of 'tackle' to a vessels hull tears free, the tail end you see go over the side is known as the 'bitter end'.
I kid you not.

All in all Mr. K's "It's easy to convince oneself that inferial systems were designed to make learning and using difficult so the old-timers could lord their knowledge over newcomers." is both true and untrue. Every trade has it's own vocabulary, I'd think doctors and lawyers are champions of garbled terms. At the same time, nautical language isn't rich (maybe) to exclude, a lot might be purely it's developed since the first guy went down a river clutching a log. Some nations never ventured beyond sight of their own coastline, others went for broke.

Too, a lot of terms originate out of need for brevity or easy correlation to signals, such as crane operators. So, where leagues (hasn't been used probably since advent of chronometers) described distance, knots referred to speed, fathoms to depth. Separating those may have lent clarity, all potentially being relayed in rapid commands therefore distinct.