Chile with an "e" at the end is the correct spelling in Spanish. Chili with an "i" at the end is the Americanized version. The "i" version began with the name of the dish "Carne con Chili," meaning "Meat with Chile." It evolved into "Chili con Carne" and then shortened to just "Chili." The term ending with an "i" is widely accepted and is often used as the name for "Chili Powder." The term "Chile" with an "e" is the more correct way to spell it, although many forms are accepted. Some accepted spellings are: Chile, Chilli, Chilly, Chilie, Chillie. From http://mexicanfood.about.com/od/mexicancookingfaqs/f/chileorchili.htm.

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Common Name	Scientific Name	Scovile Rating	Usage & Comments
Carolina Reaper	Capsicum chinense species, originally named the "HP22B	2,200,000	The original crossbred was between a red naga pepper and a Red Savina pepper.
Trinidad Moruga Scorpion	Capsicum chinense	2,009,231
7 Pot Douglah	Capsicum chinense	1,853,936
Trinidad Scorpion Butch T	Capsicum chinense cultivar	1,463,700	The "scorpion" peppers are referred to as such because the pointed end of the pepper is said to resemble a scorpion's stinger.
Naga Viper		1,349,000	It is claimed to be an unstable three-way hybrid produced from the Naga Morich, the Bhut Jolokia and the Trinidad Scorpion (some of the world's hottest peppers)
7 Pot Primo	Capsicum chinense	1,268,250	Cross between Naga Morich and Trinidad 7 Pot
Bhut Jolokia (Ghost Pepper)		1,041,427	Also known as bih jolokia, u-morok, ghost pepper, ghost chili pepper, red naga chilli, and ghost chilli. It is an interspecies hybrid of C. chinense and C. frutescens genes. For the most part this chili is more closely related to the C. chinese, but it has inherited the long thin chili shape that the C. frutescens possesses.
Ghost Pepper (Bhut Jolokia)		1,041,427	See Bhut Jolokia.
Naga Morich		1,000,000
Dorset Naga		1,000,000
7 Pot Brain Strain		~1,000,000
Red Savina Habanero		500,000