guess – v. to form an opinion or give an answer about something when you do not know much about it

prefix – n. a letter or group of letters that is added at the beginning of a word to change its meaning

variant – n. one of two or more different ways to spell or pronounce a word

vocabulary – n. all of the words known and used by a person

nickname – n. a name that is different from your real name but is what your family, friends, etc., call you

formal – adj. suitable for serious or official speech and writing

dictionary – n. a reference book that lists in alphabetical order the words of one language and shows their meanings

novel – n. a long written story usually about imaginary characters and events

hint – n. a small piece of information that helps you guess an answer or do something more easily

sarcastic – adj. using words that mean opposite of what you want to say in order to insult someone, to show irritation, or to be funny