One compound word that starts with gun is gunpowder
butterflyCompound words starting with b:backbitebackdropbackfieldbackfirebackgroundbackhandbacklashbacklogbacksidebackslidebackspinbackstopbackstretchbackstrokebacktrackbackwardbackwashbackwaterbackwoodsbagpipeballroombandwagonbankbookbankrollbarnstormbarnyardbarroombartenderbaseballbaseboardbathroombeachcomberbeachheadbedriddenbedrockbedrollbedspreadbedtimebeelinebellhopbillboardbillfoldblacklistblackmailblacktopblockbusterbloodsuckerbobcatbobtailbookmobileboxcarbrainstormbrainwashbreakfastbrickbatbridgeheadbriefcasebroadcastbrotherhoodbuckshotbuckskinbucktoothbugbearbulldogbulldozerbullfrogbullheadedbullpenbuttercupbutterfingersbutterflybuttermilkcapsize
Compound words starting with D:DanceableDaredevilDarkroomDartmouthDeadlineDealershipDeckhandDeerskinDeerstalkerDesktopDewberryDillydallyDinnertimeDinnerwareDirtballDishclothDishpanDishragDishtowelDishwareDishwasherDishwaterDixielandDocklandDocksideDockworkerDockyardDogcartDogcatcherDogfightDogfishDoggoneDoghouseDoglegDogsledDogtrotDogwoodDollhouseDoorhandlesDoorjambDoorknobDoormanDoormatDoorplateDoorpostDoorwayDooryardDotsonDovetailDownbeatDowncastDownfallDowngradeDownlandDownloadDownpipesDownplayDownpourDownstairsDowntimeDowntownDownturnDownwardDrawableDrawbackDrawbridgeDrawcordDrawstringDreamboatDreamlandDreamlessDreamlikeDreamworldDressmakerDressmakingDrillmasterDrinkableDrivewayDrugstoreDrumstickDrywallDuckbillDuckboardsDuckpinsDuckpondDucktailDuckweedDumbbellDumbfoundDumbstruckDumbwaiterDustbinDustcartDustcoverDustlessDustmanDustmenDustpanDustsheet
namedropnameplatenamesake
earlobeearmarkearpieceearplugearringearshotearthwormedgewiseeggshellendgameendpointentrywayevenhandedeverydayevermoreeveryplaceeveryoneeverythingeverywhereeyeballeyebroweyeglasseseyelasheyelinereyepieceeyesore
cakewalk
bandaid
firearmfirebrickfirebreakfireballfirecrackerfireguardfiresidefirestormfirepowerfirehousefirefightfirelightfireplugfiretrapfirewaterfiresafefireflyfiremanfiremenfireplacefireprooffiretruckfirewallfirewoodfireworks
Fallback is a compound word. Falloff and fallout are compound words.
goodness
zookeeper
toenail