A synonym for horizontal is level or laying flat.
Level is a palindrome that is a synonym for horizontal
synonym: Lower Levelantonym: Above-ground Level
Class, level, or layer.
next stage
flat, level, squat, below
group, section, level, tier
flat, even, level, polished
A synonym for 'go to the next level' is advance.
level, class, section, division, department
Third consumer or Third Level consumer.
cut down, level, demolish, knock down, hew