What is the name of a word such as "Wheat" that when you remove the first letter, it is still a word, down to two letters? Ex: Wheat, Heat, Eat, At... Spit, Pit, It. What is the longest such word, in the English language?
The process of removing the first letter (e.g. greengages->reengages) is called beheadment. What you're looking for is the longest progressive beheadment to a two-letter word. Chris Cole, in Wordplay (pub. Sterling) cites this example:
prestates restates estates states tates ates tes es