noun, noun which may take the genitive case particle 'no'
Used for the lowest rank, position, or quality. Often appears in compounds like 最下位 (lowest rank) or 最下層 (lowest stratum).
His grades were the lowest in the class.
This team is stuck at the bottom of the league.
最上 means 'highest/best', the direct opposite of 最下's 'lowest/worst'.
Compound of 最 (most) and 下 (below, bottom). The reading さいか is the on'yomi for both characters.