End, economy, egg, etc. Honestly, there's so many that this is pretty much a really dumb question.
Some math words beginning with the letter E are:EqualsEquationEquilateralEvaluateExpandExpression
Some four letter words that start with E are:eachearneaseeasteasyechoecruedgeeditelseemitenvyepicetcheuroeveneverevilexamexit
essayemaileraseelateeditsenjoyeludeerodeeagleearthelopeempty
Easter
excellent
seven letter words start with E and end with the letter A?
epha, etna, eyra
* electrifying
Evil and eerie!
emeralds
Some action words (verbs) that start with E are:earneaseeatedgeediteducateekeelateelevateelongateelucidateeludeembroideremergeemitemoteemphasizeemployempowerencourageencroachendendearenergizeensnareenterentreatequalizeequateequiperadicateeraseerodeeruptescortestimateetchevenevictexcludeexhaleexitexpireexporteye
Enemy is a war word. It begins with the letter e.