The following is a list of all Bosses in The Adventure of Link.
Horsehead(Parapa Palace)(Palace on the Sea)
Helmethead(Midoro Palace)(Palace on the Sea)
Rebonack(Island Palace)(Three-Eye Rock Palace)
Carock(Maze Island Palace)
Gooma(Palace on the Sea)
Barba(Three-Eye Rock Palace)
Thunderbird(Great Palace)
Link's Shadow(Great Palace)