bash gives different error messages

i removed a couple of my command scripts. bash is giving me different error messages. anyone know why? obviously, this is not a serious issue since i intend to not use these commands. i'm just curious about bash.
Code:lt2a/phil /home/phil 16> lndst
bash: /usr/local/bin/lndst: No such file or directory
lt2a/phil /home/phil 17> lnpar
bash: lnpar: command not found
lt2a/phil /home/phil 18>