Tautology (unnecessary repetition) – in actual fact, forward planning, raze to the ground, (raze means to the ground) two twins, (if there were three they would be triplets) adequate enough, very unique (unique means one of a kind)
Oxymoron (contradictory terms) – honest politician, deafening silence, open secret.
It is fine to use tautology or an oxymoron occasionally for emphasis or fun, but constant use of them shows an author too lazy to think outside a box of clichés.
Cement/concrete. Cement is that gray powder stuff. If she is standing on cement she’s up to her ankles in dust.
Lightning/lightening. Without the e it’s what zaps from the sky in a thunderstorm. With the e it’s what happens at dawn as the sky begins to lighten.
Wrack: when things are destroyed, wrack and ruin. Rack up a lot of debts, racked with pain.
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