the difference between vocabulary and comprehension
Thus, composition and comprehension are intrinsically linked together. The main difference between composition and comprehension is that composition involves creating something whereas comprehension involves understanding something that has been created by someone else. Thus, composition is associated with creating, and comprehension is associated with understanding.
It stands to reason, and research, that vocabulary is important for reading to learn as well as learning to read. For understanding of text, students need to be familiar with the meaning of at least 95 percent of words in any book or passage they read.