В чем разница между demon и daemon в Английском языке? Написание разное, перевод одинаковый.

А разница, Лин, такая.

«Daemon» (традиционно) — это древнегреческий демон: неопределённая мистическая сила, что влияет на человека, возникая и исчезая как бы мгновенно. Так же это — некая сила-посредник между богами и людьми. Древнегреческая.

А «demon» — это более широкое понятие. Это и «daemon», и злой дух христианства, и (некое) нежелательное состояние психики; а также тот, у кого необычная тяга к работе или такие же успехи в этой же работе.

Вот, значит, так.

dæmon

Demon - англ
Daemon - латынь
Daimon - греческий

Demon - злой дух
Daemon - добрый дух

Demon vs daemon
The words demon and daemon are spelled in a similar fashion and have similar meanings with very specific differences. We will look at the definitions of the terms demon and daemon, the difference between the two, the origin of their meanings and some examples of their use in sentences.

A demon is an evil spirit, a devil, an inhabitant of hell. Demons are often depicted with horns, a pointed tail, cloves hood and grotesques faces. Demon may also be used figuratively to describe an evil person, an intractable obsession or something harmful. Interestingly, demon is sometimes used to describe mischievousness or great skill. In New Zealand and Australia, the term demon may be used informally to a police officer. The word demon is derived from the Latin word daemonium which means lesser spirit or evil spirit.

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The idea of the daemon comes from the beliefs of the Ancient Greeks. To them, a daemon was a spiritual being falling somewhere between a god and a human, or the ghost of a fallen hero. Daemons are good or helpful spirits. The idea of the daemon has survived today as a sort of guardian angel or an inner driving force. Remember, a demon is an evil spirit, a daemon is a good spirit. The word daemon is derived from the Greek term daimōn. A more recent meaning of the word daemon is a computer process that runs in the background. An alternate spelling for daemon is daimon.
источник: https://grammarist.com/usage/demon-vs-daemon/