同級

N1 混同 kondou confusion, mixing, merger N1 同調 douchou sympathy, agree with, alignment N1 同等 doutou equality, equal, same rank N1 同封 doufuu enclosure (e.g., in a letter) N1 同盟 doumei alliance, union, league N1 一同 ichidou all present, all concerned, all of us N1 同い年 onaidoshi of the same age N1 階級 kaikyuu class, rank, grade N1 同意 doui agreement, consent; same meaning

N4 同 dou / ona.ji same, agree, equal N1 級 kyuu class, rank, grade