Xylose vs Confidential - What's the difference?

As a noun xylose

is xylose (wood sugar).

(meant to be) kept secret within a certain circle of persons; not intended to be known publicly.

(wikipedia xylose)

(organic compound) One of the pentoses, C₅H₁₀O₅, a white crystalline sugar, derived from wood.

* wood sugar

(en adjective)

(meant to be) kept secret within a certain circle of persons; not intended to be known publicly

The newspaper claims a leaked confidential report by the government admits to problems with corrupt MPs.

(dated) Inclined to share confidences.

Sitting in front of the fire, they became quite confidential , and began to gossip.

* dern

* confide