A dyke is a lesbian, a dike is a flood barrier.
A levy is a tax, a levee is a flood barrier.
A breech is found on a firearm, a breach allows water through a levee.
A site is a location, sight pertains to vision - "looters should be shot on sight."
Thank you! Elementary spelling errors grate on me like fingernails on a chalkboard. Next, let's cover "lose" and "loose"...
To whom are you giving those guidelines - anyone in particular?
By the way, even though I don't spell the word that way, my collegiate dictionary says that "dyke" is a variation of the spelling of "dike". So either spelling is acceptable.
Ah, but you're trying to eliminate one of the quickest and easiest ways a reader can measure the intellect of a poster.