Demons

Demons are intelligent powerful spirit beings.
The NT uses “demon” and “unclean spirit” as equivalents (Mark 5:13-15). “Devils,” as found in some versions is a misleading rendition. There is only one devil, but many demons.
The Greek word for devil is diabolos and the Septuagint used it to translate the Hebrew “Satan.”
The terms, daimonizomai (found 13 times), daimon (once), daimoniodes (once), and daimonion (63 times), are rendered as “demon(s)” (or some equivalent) in modern versions.