also?
atop, but that means to be on TOP of.
Other than that, are you sure it exists? i just read the whole A section of the English dictionary, which includes some other words from other languages and slang along with it.
egis
gas
hums
east
Aper
Some four letter words beginning with Y are:yardyarnyawnyearyellyelpyokeyolkyouryurt
yarn, year, your, yaks
ibex idea idol into item
span
x-ray
Abet
Alec