Okay, so imagine that we have two words that mean the same thing, like "car" and "automobile." These two words are called synonyms because they have the same meaning. Now, imagine that we have two words that are almost the same, but not exactly. For example, "jump" and "leap." They both involve moving upward, but "leap" is more dramatic and energetic. These two words are called chresonyms.
So basically, chresonyms are words that have similar meanings but also have slight differences in how they are used or what they mean exactly. They are like cousins to synonyms, but not quite the same thing. It's kind of like how you and your cousin might look alike and have some similar interests, but you are still different people with your own unique personalities and qualities.