Odd One Out is a simple and fun vocabulary activity that helps develop your students' ability to notice the relationships between words.
First: write six words on the board from one broad lexical set (ex. chair, table, window, cupboard, desk, shelf)
Second: Ask the students which word doesn't belong with the others. Ask students to tell why it doesn't belong.
Third: Continue the procedure until there are only two words left and have the class suggest ten ways in which these two words are different.