| A | B |
| coauthor | a writer who works with another writer |
| collateral | that goes along with the main thing, but in a less important way: additional or secondary |
| copilot | the assistant of the person who flies the airplane |
| sympton | something that shows that something else exists |
| synagogue | a temple |
| coexist | to go on living or existing together at the same time |
| coordinate | to bring together in the proper relation; make work well together |
| syllable | a word or part of a word |
| symmetry | an arrangement in which the parts on opposite sides of a center line are alike in size, shape, and position |
| synchronize | to move or happen at the same time or speed |
| coherent | sticking together |
| cooperative | helpful |
| symphonic | a long piece of music for a full orchestra, usually divided into four movements with different rhythms and themes |
| synthesis | the putting together of parts or elements so as to make a whole |
| syncopate | in music, to shift the accent by putting the beat at a place that would normally not be accented and holding it into the next accented beat |
| coincide | to be exactly alike in shape and size |
| symbolize | to stand for |
| symposium | a meeting for discussing some subject |
| syntax | the way words are put together and related to one another in sentences; sentence structure |
| syllabus | an outline or summary, especially of a course or study |