In the notation reference manual, 2.4.2, "Guitar". Very first paragraph reads:
"Most of the notational issues associated with guitar music are covered sufficiently in the general fretted strings section, but there are a few more worth covering here. Occasionally users want to create songbook-type documents having only lyrics with chord indications above them. Since LilyPond is a music typesetter, it is not recommended for documents that have no music notation in them. A better alternative is a word processor, text editor, or, for experienced users, a typesetter like GuitarTeX."
Thank you Kieran for showing me a possible option, I will play with it. Much appreciations.