Abdicate, abnegate, abrogate
Abdicate = (1) to give up power; (2) to cut oneself off from a responsibility. Abnegate = to deny oneself something or to surrender a privilege. Abrogate = to formally repeal or abolish.
Achilles’ heel
= the lone point of vulnerability in an otherwise powerful person or thing. Achilles is possessive, but some publications leave off the apostrophe.
Corollary vs. correlation
Corollary = an obvious deduction, a natural consequence, or a proposition that follows with little or no proof from one already proven. Correlation = a complementary or parallel relationship between two things, not necessarily involving causation or a direct relationship.
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Afterward vs. afterwards
Both are common and acceptable throughout the English-speaking world, but afterward is more common in the U.S. and Canada, and afterwards is more common outside North America.
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Funner, funnest
The only thing wrong with them is that some people think they’re wrong. But fun is an adjective in today’s English, so there is nothing inherently wrong with these forms.
Grandfather (as a verb)
= to exempt from new rules or restrictions (a person or thing predating the new rules or restrictions).
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Disassemble vs. dissemble
Disassemble = to take apart. Dissemble = to disguise or to obscure.