To "help students think carefully about specific words and their uses," Darren Crovitz and Jessica A. Miller conceive a diagram that visually expresses the spaces and ties between words. Students eagerly explore contextual connotations and defend subtle shifts in word meaning, discovering how time, use, and circumstance all influence meaning.
Crovtiz, Darren and Jessica A. Miller. "Register and Charge: Using Synonym Maps to Explore Connotation." English Journal 97.4 (2008) 49-55.