Main (Adjective) = Chief.
Synonyms: Central, Foremost, Major, Paramount, Prime, Vital
Example: His main problem at work is that he doesn't complete things properly.
Mane (Noun) = Long hair on the animal’s neck.
Synonyms: Aigrette, Cockscomb, Feather, Plume, Ridge
Example: The horse has a long and golden mane.