- haunt, obsess, ghost - haunt like a ghost; pursue; "Fear of illness haunts her"
 --1 is one way to preoccupy
 
 Sample sentence:Derived form: noun obsession2 
 The good news will obsess her
 
- obsess - be preoccupied with something; "She is obsessing over her weight"
 --2 is one way to worry
 
 Sample sentence:Derived form: noun obsession2 
 Sam and Sue obsess over the results of the experiment