Not every word has a huge significance. It might just have been that you were eating or discussing it right before waking up so thats what stuck in your mind.
I'd need the dream overall to do a big dream analysis. I'm pretty good at that. Been doing them for 14 years. With just one word at this point I'd not worry too much about it. If you are curious you could always go to bed saying I remembered bean last night. Can you give me clarity on this?
As for what I think of when I think bean are a few things 1. like pinto/refined/etc 2. green beans 3. plants-spring and the growing season 4. bean bags 5. a nick name. I mean the list goes on and on. If you don't know what it's in reference to it's hard to tell the origin of what sparked it.
Most dreams can be interpreted without involving communicating with spirits. Like last night I was dreaming about cosmetics and going shopping. Right before bed I was interested in buying stuff at a natural food store to make my own home made lip balms. (I've got allergies to some of the chemicals they use in most chapsticks and my lips swell up like I'm taking botox shots when I use them.) So the dream was just me exploring a interest I was looking at. Nothing paranormal there