Aesthetic elements help us make a verdict whether or not a certain piece of literary work is "good" or "bad" aesthetically.
This is a basic statement, of course, it is not quite that simple in reality.
An english sonnet contains 3 quatrains and a finishing couplet. a petrarchan sonnet contains an octave and a sestet.
the english sonnet has a couplet where a petrarchan sonnet does not. neither have 5 quatrains.
Vocabulary specific to a subject is called technical vocabulary. For example: A Year 1 science unit on living things may require words that are not yet part of students' vocabulary – habitat, prey, offspring.
I hope this helps!!