Latin vocabulary revision: the one with the kings, rulers and straight orders

According to the Online Etymology Dictionary, it is a 'Proto-Indo-European root meaning "move in a straight line," with derivatives meaning "to direct in a straight line," thus "to lead, rule.'

It is easy to miss the relationship and differences between words containing *reg- and their derivatives. For a start, let us take a look at the usual suspects:

If this video has made it clear, you can now test your knowledge with this Latin vocab quiz:

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If you are moving beyond beginners' Latin and into more literary, nuanced translations, you will find the definitions from the Charlton T. Lewis Elementary Dictionary - fully available in Perseus, most useful:

from *reg-: to keep straight, lead aright, guide, conduct, direct, control, to guide, lead, conduct, manage, direct, govern, sway, rule, govern, be master of, restore, set right, correct.

from regnum: to have royal power, be king, reign, to be lord, rule, govern, be supreme, tyrannise, have the mastery, prevail, predominate
 

from *reg-: kingly government, royal authority, kingship, royalty, dominion, sovereignty, rule, authority, supreme power, despotism, tyranny, personal sovereignty, arbitrary rule, a kingdom, a state governed by a king; rule, authority, power, influence; A territory, estate, possession

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