I found that others have already asked this question in the Religion & Spirituality section, and they're apparently the same thing according to Christians. I'm curious about other perspectives, though.
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fallen angels are diferent then demons.the demons are worker beings that do all the dirty work for fallen angels.the fallen ones are like gods to the demons,so the demons dowhatever the fallen ones tell them to do.that's why demons have different ranks.some has done more work for the fallen angels then the other demons are.fallen angels have way more knowledge then demons,the fallen ones were all once angels of heaven and had alot of occult knowledge.by the way occult only means hidden.the demons are created by fallen angels to do the work that they are too busy to do.fallen angels spend their time being worshipped as gods while demons spend their time preying on people and spiritual energies.like god he has angels that helps him with his work,well the fallen angels have demons that do their work.lucifer was said to be the smartest fallen angel ever,but what they don't know is that there is 2 other fallen angels that are more powerful then lucifer.if christian read the 60 something books that was taken out of the original bible by the greeks and romans they would know this.take the book of enoch(taken out of the bible by the greeks)enoch names the fallen angels by all their names and even tells what job they did in heaven before they fell.according to enoch (which jesus quoted enoch many times in the bible)there are fallen angels way more powerful then lucifer that fell from heaven and survived the flood.demons can also be created by humans but fallen angels can't.hope this helps a lil bit.i suggest you read the book of enoch to see what a man of the lord said about demons he calls them watchers and seperates them from the notorious fallenangels.if christians only knew how many books was taken out of the bible they might wake up.