\version "2.16.2"
\language "english"

global = {
  \key c \major
  \numericTimeSignature
  \time 4/4
  \tempo 4=100
}
 
chordNames = \chordmode {
  \global
  c2:maj7 c:maj    g2:sus g2       c2:maj9  c2:maj9/e      c2/d d2
}
melody = \relative c'' {
  \global
  c2  c2      g2 g2      c2 c2        c2  d2 
}

\markup "how to distinquist  c2:maj7 c:maj  &  g2:sus g2?"

\score {
  <<
    \new ChordNames \chordNames
    \new Staff { \melody }
    %\addlyrics { \verse }
    \chordmode {
        c2:maj7 c:maj    g2:sus g2       c2:maj9  c2:maj9/e      c2/d d2
    }
  >>
  \layout { }
  \midi {
    \context {
      \Score
      tempoWholesPerMinute = #(ly:make-moment 100 4)
    }
  }
}