Introduce
Part of speech: verb
Definition: To cause (someone) to be acquainted (with someone else). To make (something or someone) known by formal announcement or recommendation. To add (something) to a system, a mixture, or a container. To bring (something) into practice.
Example sentence: You're creating an intimacy that everybody feels, that it's their experience, not yours. I'll never introduce a song and say, now this song is about 'my' broken heart.
Preface
Part of speech: noun
Definition: The beginning or introductory portion that comes before the main text of a document or book.
Part of speech: verb
Definition: To introduce or make a comment before the main point.