Sure, here's a few off the top of my head + a few I found online. (brackets are optional they just give little bits of extra info)
More metaphorical ghost songs:
"Ghost" by Au/ra
(themes include fears of ending up alone, fears of everyone secretly not liking you, and a touch of disassociation)
"Right where you left me" by Taylor Swift
(Not super ghosty, but the song is sort of about someone getting trapped in a moment, like they're haunting it if that makes sense. If I remember correctly, I think her song "my tears ricochet" might be about a ghost?)
"Ghost" by Confetti
(I think it's literally about ghosting someone. Only listened to it once or twice though)
More literal ghost songs:
"Flesh and bone", "kleptomaniacrow", and "at the cemetery" by Elio Mei ("at the cemetery" is the sweetest, but all 3 are very good especially for spooky season)
"Little talks" by Of Monsters and Men (It might not be obvious, but the guy singing is the ghost of the lady's husband)
Other ones I found that I'm not sure about 'cause I either haven't actually listened to them yet or it's up for interpretation:
"Afterlife" by Mothica (Not specifically about ghosts, but the lyrics make me think of a ghost wanting to posses someone for a day to experience living again)
"Ghost of Chicago" by Noah Floersch (haven't really listened to it, so not sure what it's about)
"GHOSTS" by Pi3rce (again, haven't listened to it)
From Reddit (Idk anything about any of these):
"Highland’s Apparition" by Chevelle
(The song is about an experience where the brothers renovated and moved into an old house, kept experiencing paranormal activity and weird nightmares, and then a mysterious woman showed up in their backyard and revealed that her parents are buried out there on the property.)
"dearly departed" by shakey graves
“Little Ghost” by White Stripes
"Once a ghost, always a ghost" by curved air
That's all I got for now. If I find or remember more you may be informed if you wish