"Royal" is a fun word because you can stick the letter "T" on the end and make another word! Are there any other such words? Yes! Here are some.
These examples have the delightful quality of forming the sentence "Prince Tout, I've knighted Chris," but this is merely a delightful coincidence. The words you'll get by adding the right letters will make considerably less sense.
Answer Checker:
Hints: "Royalt" isn't a real word. What we're doing is adding the name of a letter, sounded out, to make a new word. Several of these examples can form words with a couple different letters. (It's not a very good puzzle overall.) Keep trying different letters until you find five that spell out a word.