あいでし【相弟子】
fellow pupils私たちはお花の師匠太田先生の相弟子ですBoth of us study flower arrangement under Mrs. Ohta.
あにでし【兄弟子】
a senior fellow disciple [pupil]
いちばんでし【一番弟子】
〔最も早い弟子〕one's oldest pupil [disciple];〔最も優れた弟子〕one's best pupil [disciple]
うちでし【内弟子】
内弟子をとる[おく]accept [keep] a boarding pupil原先生の内弟子になったI was apprenticed to Mr. Hara.
おとうとでし【弟弟子】
a younger pupil [disciple] (of the same teacher); a younger fellow pupil [disciple]