All 3 Uses

phobia
in
The Bean Trees
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My boyfriend, which at that time was Eddie Tubbs, it was way before I met Angel, thought it was fear of heights and told everybody on the bus on the way home that I had ackero-phobia, but it was way more complicated than that.†
Chpt 7.

phobia = extreme and unreasonable fear of something
I mean, ackero-phobia doesn't have anything to do with being afraid you'll holler out something god-awful in church, does it?†
Chpt 7. *
I think what you mean is a totally different phobia.†
Chpt 7.

Definitions:

(1) (phobia)
extreme and unreasonable fear of something

Many words end with "phobia" to indicate "fear of" something. It is also common to turn the noun into an adjective with an "ic" suffix; e.g., "phobic" or "xenophobic."
(2) (meaning too rare to warrant focus)