Many of them change to -ies for the plural.
Some words that start with G and end with Y are:gabbygalaxygalleygaudygaygenealogygentlygeographygeologygeometryghastlyghostlygigglygiddygingerlyglorygoodygoofygorygraduallygravellygravelygravitygravygraygreedygullygummyguppyGuy
Some words that start with a vowel and end in a Y are:animosityanyelectrifyenemyeveryexactlyonlyorneryuglyusury
Ier is a comparative suffix. This suffix happens when there is a y on the end of an adjective like happy-happier.
Some four letter words that end with Y are:ablyahoyairyarmyawaybabybevybodyboxybuoyburybusycityclaycloycopycozydefydenydewydulydutyeasyeddyedgyenvyflayfoxyfrayfurygorygrayhazyholyickyidlyiffyinkyjoeyjurylacyladylazylevylilymanynarynavynosyobeyoilyokayonlyoozyorgypityplayployponypraypreypunyquayracyrelyrosyrubysexyslayspaysprystayswaytheytidytinytonytraytroyuglyvaryverywarywavywaxywheywilywiryzany
Zesty and zanily end with Y. Zealously, zestfully and zoologically end with Y.
You.
airyachybutterycreepycatchyclingydewydirtyeasyfishygrittyhairyicyjumpykinkylumpymoldymightymintyneedyornerypushyqueasyrunnyrockyriskysunnysugaryscarytouchytrickyunhealthyvoluntarywateryyeastyzesty
uncommonlyuncertaintyuniformlyuglyunityuniversallyunusuallyunwillinglyusuallyuselesslyunconsciously
yellowyeweyebrowyarrowhoneydewplayfellowanyhowyow
Some words that end in "y" and make the long i sound are rely, deny, and terrify.
There are words that end with z and begin with most letters. However, there are no words in the English language that begin with y and end with z.
Some words that end in the vowel y and add es to form the plural are alley, journey, and key.