Meaning : Think moodily or anxiously about something.
Synonyms : brood
Meaning : Exist or be situated within.
Example :
Strange notions inhabited her mind.
Synonyms : inhabit
Meaning : Come back to.
Example :
Don't dwell on the past.
She is always harping on the same old things.
Synonyms : harp
Dwell meaning in Bengali (Bangla).