Aphorism: Short, sweet little sayings expressing an idea or opinion are familiar to everyone — they just don’t always know the technical term for them. Dorothy Parker was a particularly adroit user of aphorisms.
Apostrophe: Beyond a term for daily punctuation, apostrophe also pulls audiences aside to address a person, place or thing currently not present. O, Shakespeare! Such a sterling example of apostrophe use!
Applicability: The venerable Lord of the Rings author J.R.R. Tolkien coined this term when badgered one too many times about whether or not his beloved fantasy series was supposed to be a World War II allegory. It wasn’t, but he thought readers could easily apply such an interpretation to the text without losing anything.