Does "Album" mean vinyl? Do CDs count?
To be a great album, in my mind, it has to have good-to-great songs throughout, not just a few solid cuts but something you enjoy listening to repeatedly from beginning to end. Among my candidates:
"Salute" - Gordon Lightfoot
"Strong Persuader" - Robert Cray Band
"Too Low For Zero" - Elton John
"Rubber Soul" - The Beatles
As for "greatest hits" and CD compilations, my top one is "A Decade Of Steely Dan".