Homographs are words that are spelled the same regardless of pronunciation (they may be pronounced the same or differently). Homonyms are words that are both spelled and pronounced the same. Therefore a homonym is both a type of homograph and a type of homophone. To be correct I believe the Venn diagram should have one circle labeled homograph and the other labeled homophone. The intersection should be labeled homonym.
An Excessive Heat Warning is issued when heat indices are expected to reach at least 105 degrees, except at least 110 degrees over Delmarva and far southern New Jersey (Salem, Cumberland, Cape May, and Atlantic Counties).
1 Excessive Heat Warning: issued when the heat index will be high enough to be life threatening in the next 24 hours. 2  This warning indicates that the excessive heat is imminent or has a very high probability of occurring. 3  Excessive Heat Advisory: similar to an Excessive Heat Warning, but less serious.