flu
Nim
assegai
There hasn't been one with three letters beginning in u and ending in n.
Anaconda.
The country name that beginning with 'A' but not ending in 'A' is Azerbaijan
Gem
3 letter words ending in an:BanCanFanManPanRanTanVanYan(is a name)
ailanto
Bay Stater
emptying, ending, exiting
Anden, Allen, Alden, Anton, Avery...
Llama Impala *It's hard to tell if the beginning letter should be a lower case l or an uppercase I.