Some substances (compound or element) melt, when heated, and vaporize when heated further. Some substances don't melt, but simply vaporize, for example elemental iodine, this is called sublimation.
You can get the sublimation for substances that usually melt, by reducing the pressure. This is the case with ice, which can "disappear" on days when the temperature is below freezing. You can melt something that usually sublimes, if you increase the pressure, this is done with CO2 for use in supercritical extraction. As the pressure over a liquid varies, the temperature for its vaporization changes. Therefore, while it's technically correct to find multiple values for melting, sublimation and vaporization, you're not correct in using the word "sublimes" as a noun, nor connecting the "sublime" with the phenomena.
The nature of Sn(IV) Iodide is confusing for me, Wikipedia says it melts at 143 C, a google search leads me to a text by Wiley publishers that says it sublimes at 180 C, but I don't have the context for these observations. They can't both be right as is, but neither source specifies pressure, so, they might be, I just can't tell.