noun which may take the genitive case particle 'no', noun
top-level; top-ranking
Describes something at the highest rank, tier, or quality. Used as a noun or with の to modify another noun.
彼はトップレベルの選手だ。
He is a top-level athlete.
この会議にはトップレベルの専門家が集まった。
Top-level experts gathered for this conference.