The kanji word "悪魔 (あくま - akuma)" means devil and the first kanji character "悪 (あく - aku)" means badness. And we have several kanji words which we use kanji "悪" in them. The following words are some examples of them.
"悪漢 (あっかん - akkan)" mean bad guy – hoodlum.
"悪霊 (あくれい - akurei)" means evil spirit.
"悪党 (あくとう - akutou)" means scoundrel.
"悪巧み (わるだくみ - warudakumi)" means intrigue.