Synonyms

  phone UK, informal (to contact someone using the telephone): I’ll phone you later. She phoned you last night, but you were out. call (to telephone someone): Where are you calling from? Call me seven in the morning. ring UK spoken (to telephone someone): You can ring me at the office tomorrow. …

  obvious (easy to see, notice, or understand): The answer is perfectly obvious to me. clear (obvious and leaving no doubts): It was clear that he was lying. crystal clear (very easy to understand): The truth was crystal clear to everyone. apparent formal (easy to see, notice, or understand): It became apparent that we …

  necessary (needed to have or do in order to make a situation possible): No experience is necessary for this job. Oxygen is necessary for life on earth. essential (extremely necessary and important): It is essential to prepare for the exam. vital (essential for something to succeed or exist): Vitamins and minerals are vital …

monitor (to regularly check or watch over a period of time in order to find out what is happening): The nurse will monitor his heart rate. observe formal (to watch someone or something carefully and attentively): The police were observing his movements. watch (to look at attentively over a period of time): …

  lake (a large area of water surrounded by land): This lake is dangerous for swimmers. lagoon (an area of water that is separated from the sea by a reef or sandbar): The water in the lagoon was calm. pond (a small area of fresh water formed naturally or created artificially): …