Yes, for playlists, you have to use the word 'playlist', e.g., "play my enya playlist", or "play the playlist enya"
For the last, you could try: "play the album ten by pearl jam"
Here are the rules!
If you say "play" with no modifier, HouseBand should play everything that matches that string, no matter where the terms show up (album title, track title, artist name, etc).
"play the album..."
"play the track..."
"play songs by..."
"play the playlist..."
will look for album, track, artist, playlist, respectively.
Generally, recognition is better with a modifier, because Amazon's AI is contextual. So if it hears keys music-related words, it will be biased toward artists, albums, etc.