The term 'OPENING LINES' can be summarized by two crossword solutions: INTRO (5 letters) and WANTAD (6 letters). INTRO is a shortened form of the word introduction, which is typically the first part of a speech, book, or other written work. WANTAD is an abbreviation for 'want ad, ' which is an advertisement placed in a newspaper or other publication seeking employment, housing, or other services. Both of these terms refer to the beginning of something, making them appropriate solutions for the term 'OPENING LINES.'