#If you wanna be really generous with the definition of ''ghost'' Adam can also reanimate dead people like in Strange Tales Vol1 178

[adamwarlock]

sorry, has* adam interacted with ghosts?

With ghosts?? 🤔 Yes sort of, when Adam confines the Magus and the Goddess within Soul World. Magus calls himself a ''wraith of frustration'' in Warlock Chronicles #4 and later in Infinity Crusade #6 says they're like ghosts since they can't interact with anything.

Also in Thanos: The Infinity Revelation Adam just hangs around Mistress Death's realm as somekinda ghost/spirit until she makes him Thanos' problem instead lol