slope

[1]	incline , decline , ascend , descend , rise , fall , dip , sink , drop (off) , angle , slant , pitch , tilt , tip
[2]	incline , pitch

[1]	incline , side
[2]	gradient , incline , decline , ascent , descent , acclivity , declivity , rise , fall , ramp , dip , sink , drop , angle , slant , pitch , tilt , rake , tip , camber , cant , grade , bevel , hill , bank , mount , gradient , (US) grade , upgrade , downgrade