Four letter words with the same first and last letter are:
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Some examples are... aqua, barb, chic, dead, else, gang, hath
kayak and level
geeseorderpriorteaseceaseleasedryerpeacepastaversemottosalsaparkanerveservetersekarmastartstintstiltaddedaidedmergeledgehedgesergewedgecallagammamannaseizeteaseerrorrodeopoliofencetensedensepencepandamambasambapapaw
Alliteration
addallassbeeboocooebbeggerrfeegeeillinnleeloomoooddoffpeeseeteetoozoo