It's you that is making your head hurt, not the vocabulary.
The same word has different meanings based on the context in which it is used. Just mention 45-70 calibre* to a Navy gunner and watch their eyes
as they try to envision it.
Within context the words provide precision. The confusion comes from those who throw the words around without context.
A 10/22 or a .357 lever gun is a "rifle" because it is a long gun that fires a single projectile through a rifled barrel.
For someone not interested in going any farther into the nomenclature, describing a shoulder-fired firearm as a "rifle" is sufficient.
But then, it's not a rifle, because a long gun that fires such underpowered ammo is really a carbine.
Now you are beginning to teach the finer points of how shoulder-fired firearms are described. Hopefully the student wants to know about the finer point.
But a carbine is also a rifle in a rifle caliber that is shorter than other rifles.
Now you have introduced more precision - presuming you can show how to separate long-barreled shoulder-fired firearms using pistol calibers from shorter-barreled shoulder-fired firearms using rifle calibers. And that you have explained why a cartridge that uses a .30 caliber bullet is a rifle caliber while a cartridge that uses a .45 caliber bullet is a pistol caliber.
And we keep insisting that guns aren't even guns, because a gun is an artillery piece.
Wikipedia says artillery "
- riginally applied to any group of infantry primarily armed with projectile weapons, artillery has over time become limited in meaning to refer only to those engines of war that operate by projection of munitions far beyond the effective range of personal weapons." So crw-served machine guns are artillery, too. As would be the firearms used by snipers/designated marksmen.
And the evil side also conflates the issue with both intentional and unintentional misuse of terms, even to the point of "large-capacity magazine clips" (of which I want several as they might speed up my reload times). But try explaining to an anti-gun rights person who really does not care about precision in the use of terms why that is wrong. BTW - could you, if you had an oppoortunity to correct the error, actually look at yourself in the mirror if you let legislation get passed that contained such a term? (My answer would be "No, but only because I am still rolling on the floor laughing and thus cannot stand up to see the mirror.")
stay safe.
* - "caliber" and "calibre" are not the same thing. If you do not know why, go look it up.