whooper swan(n = noun.animal) cygnus cygnus, whooper - common Old World swan noted for its whooping call;
is a kind of swan
is a member of cygnus, genus cygnus

bewick's swan, black swan, mute swan, swan, swan dive, swan orchid, swan river daisy, swan river everlasting, swan song, trumpeter swan, tundra swan, whistling swan, whooper