Enthusiasm vs Illusion - What's the difference?

As nouns the difference between enthusiasm and illusion

is that enthusiasm is possession by a god; divine inspiration or frenzy while illusion is anything that seems to be something that it is not.

(wikipedia enthusiasm)

(obsolete, or, historical) Possession by a god; divine inspiration or frenzy.

* 1946 , Bertrand Russell, History of Western Philosophy , ch. 1

The intoxication that they sought was that of ‘enthusiasm ’, of union with the god.

Intensity of feeling; excited interest or eagerness.

Something in which one is keenly interested.

* 1968 , Central States Archaeological Journal (volumes 15-16, page 154)

My main enthusiasm is attending and seeing the progress and interest of collectors, to meet old friends, and hopefully to make new friends.

* 2012 , Nicholas Joll, Philosophy and The Hitchhiker's Guide to the Galaxy (page 23)

Other Adamsian enthusiasms included: fast cars; restaurants; Bach, the Beatles, Pink Floyd and Dire Straits;

(wikipedia illusion)

(countable) Anything that seems to be something that it is not.

We saw what looked like a tiger among the trees, but it was an illusion caused by the shadows of the branches.

Using artificial additives, scientists can create the illusion of fruit flavours in food.

* 2002 , (The Flaming Lips),

You realize the sun don't go down it's just an illusion caused by the world spinning round.

(countable) A misapprehension; a belief in something that is in fact not true.

Jane has this illusion that John is in love with her.

(countable) A magician’s trick.

(uncountable) The state of being deceived or misled.

* (the state of being deceived or misled) misapprehension

* illusionist * illusory * optical illusion * under the illusion that