Both comprehension and understanding can be used to talk about someone's ability to understand something. Comprehension usually used with of. Knowledge about a subject, situation, etc.
Canons of taxation PPT
Understanding a concept means you get it. Understanding implies abilities and dispositions with respect to an object. He noted bond's apparent lack of.
How to use understanding in a sentence.
The meaning of understanding is a mental grasp : Understanding is a relation between the knower and an object of understanding. Your understanding might be that your mother will always drive you to school if you miss the bus. Or about how something works: