Exact(1)
These words don't yet have strict rules for usage, and most people who use them will be happy to state their preferred usage if you ask politely.
Similar(7)
Instruct the students to correct the two sentences and then to derive, from the examples, specific rules for proper usage of the punctuation marks in question.
Spelling and grammar checkers, Components of word-processing programs for personal computers that identify apparent misspellings and grammatical errors by reference to an incorporated dictionary and a list of rules for proper usage.
Depending on the grammarian's approach, a grammar can be prescriptive (i.e., provide rules for correct usage), descriptive (i.e., describe how a language is actually used), or generative (i.e., provide instructions for the production of an infinite number of sentences in a language).
Part of the answer seems to be that when one is dealing, for example, with a concept that is distinctive of a particular author rather than common to a whole culture, one typically faces a problem of relative paucity and lack of contextual variety in the actual uses of the word available as empirical evidence from which to infer the rule for use, or usage, constitutive of its meaning.
Rules of usage are well worth mastering, but they pale in importance behind principles of clarity, style, coherence, and consideration for the reader.
The FAA wasn't expected to make any rules for commercial drone usage before the end of 2015.
Under the rules for commercial drone usage, or Part 107, there's no insurance requirement.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com