anyway, anywhere: Frequently misspelled anyways, anywheres. These words should never be written with a final s.
apostasy: In modern usage the last syllable is spelled with an s. The alternative spelling, apostacy, though occasionally used, is not preferred.
apparent, evident, manifest: Do not confound apparent with evident, because what is apparent may or may not be evident. That is apparent which appears to be, as apparent sincerity; but appearances may be false. Things are not always what they seem. "That is evident of which the mind is made sure by some inference that supplements the fact of perception. That is manifest which we can lay the hand upon: manifest is thus stronger than evident, as touch is more absolute than sight." See heir.
appear, seem: Discriminate carefully between these words. Appear refers to that which manifests itself to the senses; seem applies to that which is manifest to the mind on reflection. Seem gives or creates the impression of being. A man may seem honest but cannot appear so.
appreciate: This verb has the intransitive sense of "to increase in value," despite the fact that some critics (though without justifiable cause) object to its use in such a phrase as "real estate appreciates as the city grows."