Melody

A melody (also tune) is described as a series of various pitches sounded in succession.

Twinkle, twinkle, little star, from aboutmusictheory.com

Contour describes the linear motion of a melody up and down.  Melodic contour (shape) can be: ascending, descending, linear, undulating, broken line

Undulating. Good morning, from Teledmus

Broken line. From aboutmusictheory.com

Linear. One note samba. From jazz-styles.com