bottom

Synonyms: basal base basement basic foundational ground last lowermost lowest meat-and-potatoes nethermost primary radical rock-bottom underlying undermost

Antonyms: highest top unnecessary

Synonyms: base basement basis bed bedrock belly deepest part depths floor foot footing ground groundwork lowest part nadir nether portion pedestal pediment rest seat sole substratum substructure support terra firma underbelly underneath underside

Antonyms: top

Synonyms: basis bottom line cause essence essentiality ground heart mainspring marrow origin pith principle quintessence root soul source stuff substance virtuality

Antonyms: exteriority outside

Synonyms: backside behind breech bum butt buttocks derrière fanny fundament posterior rear rump seat tail tush