C chords (or B # / B sharp)
C # / C sharp (or D b / D flat)

C Major
C m / C minor

C 7 / C seventh
C m 7/ C minor 7

C Major 7
C sus 4

C 9 (ninth)
C 5 (fifth)

C minor 6
C 6 (sixth)

C # M / C sharp Major
C # m / C sharp minor

C # 7 / C sharp 7 (seventh)
C # m / C sharp minor

C # M 7 / C sharp Major 7
C # sus 4 / C sharp sus 4

C # m 7 / C sharp minor 7
C # 9 / C sharp 9 (ninth)

C # m 6 / C minor sharp 6 (sixth)
C # 6 / C sharp 6 – C # 5 / C sharp 5 (fifth)