The term 'TESTER WATER' is composed of two words, 'TESTER' and 'WATER'. The first word, 'TESTER', is a three-letter word that can be found in a crossword puzzle. It is a job title for someone who tests products or services to ensure they meet certain standards. The second word, 'WATER', is a four-letter word that can also be found in a crossword puzzle. It is a substance composed of hydrogen and oxygen molecules that is essential for life on Earth. Together, the two words form the phrase 'TESTER WATER', which is used to describe a person who tests WATER quality.