Could someone please tell me the difference between the prefix "fi-" and the infix "-acx-"?

The vortaro in the side-bar of the Lernu website defines "fi-" as "nasty" and "-acx-" as "awful, rotten, terrible", but those seem pretty similar to me. Perhaps the difference is in their use?

FI-
-AĈ-

michaleo:FI-
-AĈ-

Ah, OK, thanks. That makes more sense. I do have a follow-up question now, though: is there any reason one couldn't use both in one word? For example, in the link, "kuracistacxo" is defined as a "quack". Could one say "fikuracistacxo", for a doctor who is immoral as well as ineffective?

Furthermore, is there a limit on the number of affixes you can use in one word?

Zefo96:

michaleo:FI-
-AĈ-

Ah, OK, thanks. That makes more sense. I do have a follow-up question now, though: is there any reason one couldn't use both in one word? For example, in the link, "kuracistacxo" is defined as a "quack". Could one say "fikuracistacxo", for a doctor who is immoral as well as ineffective?

Furthermore, is there a limit on the number of affixes you can use in one word?

There's no limit but you shouldn't make words too long because it's unnatural and ineffective. Fikuracistaĉo is quite good.

michaleo:

Zefo96:

michaleo:FI-
-AĈ-

Ah, OK, thanks. That makes more sense. I do have a follow-up question now, though: is there any reason one couldn't use both in one word? For example, in the link, "kuracistacxo" is defined as a "quack". Could one say "fikuracistacxo", for a doctor who is immoral as well as ineffective?

Furthermore, is there a limit on the number of affixes you can use in one word?

There's no limit but you shouldn't make words too long because it's unnatural and ineffective. Fikuracistaĉo is quite good.

Great, makes sense. Thank you.