Don't boot me for this one - lol
I would say it's this site that got me started on all these genres when looking up bands.
So just seeing how everyone labels things.
For me:
Ballsy Rock 'N' Roll - ACDC, Jackyl, Kix, Dirty Looks
Sleaze Glam - Poison, Nitro, Roxx Gang
Glam - Hanio Rocks, Alice Cooper
AOR - John Waite, Bryan Adams
Melodic Hard Rock - Bon Jovi, Nelson, White Lion
Hard Rock Glam (if I were to use this one) - Motley Crue, Ratt
Hard Rock - Guns N Roses, Tesla, Dokken, Winger, Bonfire, Gotthard, Fair Warning
Blues Hard Rock - Cinderella, Tangier, Whitesnake
Melodic Metal - Axel Rudi Pell, Queensryche, Scorpions
Heavy Metal - Metallica, Megadeth, Judas Priest, Iron Maiden
Power Metal - Avantasia, Freedom Call