Bivouac.
ballistic
balsamic
barbaric
basic
beatific
biographic
biologic
bionic
biopic
bombastic
bulimic
bucolic
sadisticsarcasticsardonicsatanicscenicscientificshellacsimplisticseismographicskepticsociopathicsporadicsoporificspasticspecificstoicstaticsumacsystematicsyllabicsymbolicsymphonicsystemic
Alec
caloriccausticceramicclassiccoloniccryptic
A four letter word beginning with C and ending with X is crux.
havoc
stoic
Card or could?cadcalculatedcallusedcardboardcarloadcampgroundcandiedcarbonatedclapboardcanardcenteredcertifiedcentralizedcaramelizedcelluloidchildchordcivilizedcladcordcontendcollardcorneredconfoundconfinedconfusedcontrabandcornbreadcorrugatedconfinedcomprehendcombinedcommandcompoundcommendcrudcriedcreedcupboardcummerbundcustard
The word you are looking for is "cayman". Caymans are crocodilian reptiles that have a long, skinny snout.
Five letter words starting with C and ending with X are calyx and codex.
Charisma, chickpea, Casanova, Canberra
Kinetic and kleptomaniac begin with the letter k. They end with the letter c.