The term 'close together' can be described by three crossword solutions: DENSE (5 letters), JUXTAPOSED (10 letters), and SIDEBYSIDE (10 letters). DENSE means having a high concentration of elements in a given area, while JUXTAPOSED means placed side by side or near each other for comparison or contrast. SIDEBYSIDE, as the name implies, means two things that are placed next to each other. All three words describe the concept of being close together, but each has its own nuances.