discreet, discrete

Discreet or discreet means having the ability to keep a secret, or to refrain from giving a secret away, as a form of tact or savoir-faire--
Try to find out what the boss is planning, but be discreet.
Be discreet when you try to find out if he's interested.

Discrete or discrete ( rhymes with discreet ) means completely distinct or separate--
The people assembled formed three discrete groups.
He attempted to classify the information into discrete categories.

Now that you know that, you can say--
"His injunction to be discreet had four discrete parts."

Note--"discretion" is the noun ( thing or idea ) form of "discreet"--
"Discretion is the better part of valor."
Use discretion when asking for personal information.
Note # 2--"indiscreet" means lacking tact, or blabbing something that should have been kept a secret, such as a personal opinion of one's employer, or an illicit relationship or extramarital affair--
Posting that note about your boss was indiscreet.
"sexy ladies, from the 80's who are indiscreet..."