loon 1
/loohn/ , n.
any of several large, short-tailed, web-footed, fish-eating diving birds of the genus Gavia, of the Northern Hemisphere.
[ 1625-35; perh. alter. of LOOM 3 ]
loon 2
/loohn/ , n.
a crazy or simple-minded person.
[ 1400-50; late ME lowen, perh. luinn worn, tired; later influenced by LOON 1 and LOONY ]