"A person who leaves [their] home or country to find safety, esp. during a war or for political or religious reasons." (CD)
See also: https://dictionary.cambridge.org/us/dictionary/english/refugee
The graph displays the other subjects mentioned on the same pages as the subject "Refugees". If the same subject occurs on a page with "Refugees" more than once, it appears closer to "Refugees" on the graph, and is colored in a darker shade. The closer a subject is to the center, the more "related" the subjects are.