A maniac for something & I can well understand that.
I am curious to know about how to make the sentence with the word 'maniac' and which one is correct between the two. Can you say either 'a maniac for something' or 'a something maniac'?

For instance,
[A] He was a maniac for the camera.
[B] He was a camera maniac.

The two options above are perfectly fine to say?

Another example:
[A] They are maniacs for the fishing.
[B] They are fishing maniacs.

Here is an extra question:
While learning English, I've often seen the following sentence : I can understand that well
By the way, I heard an English native speaker say "I can well understand that" a few days ago.
It might be acceptable in spoken English, I guess.
I wonder that if you were an English teacher, you wouldn't correct it? The postion of 'well'

Question

A maniac for something & I can well understand that.
I am curious to know about how to make the sentence with the word 'maniac' and which one is correct between the two. Can you say either 'a maniac for something' or 'a something maniac'?

For instance,
[A] He was a maniac for the camera.
[B] He was a camera maniac.

The two options above are perfectly fine to say?

Another example:
[A] They are maniacs for the fishing.
[B] They are fishing maniacs.

Here is an extra question:
While learning English, I've often seen the following sentence : I can understand that well
By the way, I heard an English native speaker say "I can well understand that" a few days ago.
It might be acceptable in spoken English, I guess.
I wonder that if you were an English teacher, you wouldn't correct it? The postion of 'well'

Answer

"Maniac" is not so common a word these days, although we all know it. I had a check online (yes, you can do this too), and it seems that it's uncommon to use gerunds after "a maniac for".

I suggest looking for real examples online and working out how we use the word from that. Your examples are understandable, but not natural, sorry.

For the second question, the meaning of "well" changes.

"I can well understand that" = I can certainly understand that. You're right, this is a colloquial (spoken) form.
"I can understand that well" = My ability to understand that is good.

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