Tell you what gives me the 'ump......
Spelling - one word in particular........... "Discreet".
Discreet= "Showing prudence and wise self-restraint in speech and behavior; circumspect." (i.e. relevant if you don't want someone shouting their gob off)
Discrete= "Consisting of unconnected distinct parts. " (i.e. not much relevance to ads on this site)
Discreat = No Such Word!
(Who said this site ain't educational)