How can I easily differentiate between when to use "relationship" and "relation". More often than not, I tend to use "relationship", but would really like to know how these are to be used in writing. Speaking from a general viewpoint, the definition for both of these is almost similar. (this is something I've gathered from a simple Google Search) When discussing two entities, relationship seems to be an appropriate choice. But there are times when these could be interchangeable. For e.g., the relation between writing and reality OR the relationship between writing and reality. So are there are rules or pointers that are to be kept in mind to avoid using these incorrectly?