Words with two double Es is beekeeper (and variants), peewee, and teepee.
Some words that have double Es are:agreeamputeeapogeebansheebeebeechbeefbeenbeepbeerbeetbeetlebeseechbetweenbleedbooteebreechbreedbreezebungeecanteencareencareercheekcheepcheercheesecheetahchickadeecoffeecouleecreelcreepdecreedeeddeemdeepdeerdegreediscreetemceeengineerexceedfeefeeblefeedfeelfeetfianceefiligreefleefleecefleetfreefreezegeekgeesegenteelgleegoateegreedygreengreetheedheeljamboreejeepjeerjubileekeelkeenkeepkneeleeleechleekleerleveelicheemanateemarqueemeekmeetmeleeneeneedneedlenegligeeoverseeparakeetpedigreepeepeekpeelpeeppeerpeevepeeweepreemiepreemptpreenproceedprotegeepureequeenqueerreedreefreeferreekreelrefereerefugeerupeesateenscreescreechscreenseeseedseekseemseenseepseerseesawseethesheensheepsheersheetskeetsleeksleepsleetsleevesneersneezespeechspeedspleenspreesqueegeesqueezesteedsteelsteepsteeplesteersteeragestreetsucceedsweepsweetteeteemteenteethteethetepeetheethreetoffeetoupeetreetureentweedtweettweezerveejayveerveneerweeweedweekweenweepweevilwheewheedlewheelwheezeyippee
Cheeses, nemeses.
Some four letter words with double Es are:aleebeefbeenbeepbeerbeetCreedeeddeemdeepdeerepeefeedfeelfeetfleefreegleeheedheeljeepjeerkeelkeenkeepkneeleekleermeekmeetneedpeekpeelpeerreedreefreekreelseedseekseemseenseepseerteentheetreeveerweedweekweepwhee
Some words with three Es and two Rs are:breedercreepierevergreenperimeterpretenderrefrigerateregenerateremembertelepromptertemperature
accessaccommodationsbrassinessbeefinessembarrasscoffeechildlessnesscarelessnesscoolnesscheerfullycrisscrossclasslesscommitteecommittedfussinessfootlessfearlessnessfootloosefoolishnesshellishnesshopelessnessheaddresshappinessjoblessnesslawlessnessmoonlessmessinesspuffinessprissinesspeevishnesspennilessraccoonruthlessnesssuccesssleeplesssloppinesssleevelessspookinessstuffinessstiffnessspeechlesssillinessscruffinesstoothlesstattootoffee
Some words that have double Es are:agreeamputeeapogeebansheebeebeechbeefbeenbeepbeerbeetbeetlebeseechbetweenbleedbooteebreechbreedbreezebungeecanteencareencareercheekcheepcheercheesecheetahchickadeecoffeecouleecreelcreepdecreedeeddeemdeepdeerdegreediscreetemceeengineerexceedfeefeeblefeedfeelfeetfianceefiligreefleefleecefleetfreefreezegeekgeesegenteelgleegoateegreedygreengreetheedheeljamboreejeepjeerjubileekeelkeenkeepkneeleeleechleekleerleveelicheemanateemarqueemeekmeetmeleeneeneedneedlenegligeeoverseeparakeetpedigreepeepeekpeelpeeppeerpeevepeeweepreemiepreemptpreenproceedprotegeepureequeenqueerreedreefreeferreekreelrefereerefugeerupeesateenscreescreechscreenseeseedseekseemseenseepseerseesawseethesheensheepsheersheetskeetsleeksleepsleetsleevesneersneezespeechspeedspleenspreesqueegeesqueezesteedsteelsteepsteeplesteersteeragestreetsucceedsweepsweetteeteemteenteethteethetepeetheethreetoffeetoupeetreetureentweedtweettweezerveejayveerveneerweeweedweekweenweepweevilwheewheedlewheelwheezeyippee
This is not strictly true, as words could also have -i, or -es, or if it has a double vowel in the word, these might change to another double vowel or two different vowels.
For an English plural, the answer is never. Some words ending in the letter 's' are made plural by adding 'es', such as one bus, two buses or one class, two classes.
Examples of words with two Es are:agreebreezecreeddeedeeriefreegreenheelindiscreetjeerkneeleemeetneedoverseepreenqueenreedseedtreeupkeepveerweekyippeezookeeper
Cheeses, nemeses.
Some four letter words with double Es are:aleebeefbeenbeepbeerbeetCreedeeddeemdeepdeerepeefeedfeelfeetfleefreegleeheedheeljeepjeerkeelkeenkeepkneeleekleermeekmeetneedpeekpeelpeerreedreefreekreelseedseekseemseenseepseerteentheetreeveerweedweekweepwhee
amazesapologizesbaptizesbrutalizesblazesbreezescrazescriminalizescustomizesdozesenergizesemphasizesfantasizesfreezesgazesgeneralizesglamorizeshazeshomogenizesmazesmemorizesnaturalizesoptimizesprizespopularizesrealizessanitizessizessummarizessterilizestheorizestraumatizestantalizestranquilizestrivializes
Some words with three Es and two Rs are:breedercreepierevergreenperimeterpretenderrefrigerateregenerateremembertelepromptertemperature
quizzes and buzzes does that help you out :P
Box and dish are two of them.
no = no and es means is
Pantheresses. It is a perfectly standard formation: words whose singular ends with a double 's' form their plural by adding 'es'.