A stanza.
The words to a song are known as "lyrics."
Its called an Unknown song
The words to a song are called lyrics.
A song with the lyrics removed would just be the instrumentation of XYZ song. A song without any lyrics in the first place is called an instrumental.
An Instrumental
Lyrics for the song called I'll Be Missing You can either located by looking at any inserts that came with the disc the song is on, or lyrics for the song can be found online at such websites as Metro Lyrics.
The song Innocent by Our Lady Peace has the lyrics "We are all innocent" as its chorus.
The song called "Can I Live" was released in the year 1991. One can find the lyrics to this song at popular on the web sources such as A to Z Lyrics and Metro Lyrics.
You mean if you improved the lyrics? That is the job of the arranger. He/she polishes the melody of the song (and the lyrics). Every detail of the song is thought about before the final version is made and ready to be performed and interpreted by the chosen singer. It is called arranging.
Lyrics to the song Breaking Benjamin by Firefly can be found on a website which is called A-Z Lyrics. They can also be found on the website called eLyrics.
The Chipmunks recorded a song called 'Then and Now' featuring Jermaine Riley. The lyrics to this song can be found both on A-Z lyrics and Metrolyrics.