level has 27 distinct synonyms spread across 14 of its 19 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is raise.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
a relative position or degree of value in a graded group
“lumber of the highest grade”
height above ground
“the water reached ankle level”
indicator that establishes the horizontal when a bubble is centered in a tube of liquid
a flat surface at right angles to a plumb line
“park the car on the level”
aim at
“level criticism or charges at somebody”
2 of the 19 recorded senses carry no synonym, antonym or related term, so they are not shown above. Every sense, with its definition and examples, is on the full entry for level.
Synonyms, antonyms and the broader and narrower relations for level come from Princeton University’s WordNet. Full sources and licences.
talk frankly with; lay it on the line
“I have to level with you”