blunder It was his great blunder to have ordered the soldiers to attack the enemy in the daytime. brink He fell over the brink of the cliff, but was only slightly hurt. cab It is very hard to catch a cab in the rush hour. cast The fishermen cast their nets into the sea. component A chemist can separate a medicine into its components. convention It is a matter of convention that men should open doors for ladies. Businessmen attend conventions to learn of new developments and products. expel A pupil who cheats or steals may be expelled from school. notable China has made notable development since 1978. spectacle The sunrise as seen from the top of the mountain was a great spectacle. The old man bought a new pair of spectacles. tackle He bought some fishing tackle in the store. The robber tried to run away, but a brave man ran and tackled him. throng At the railroad station I saw throngs of passengers waiting for their trains. waver As I opened the window, the flame wavered and then went out.