noun
aikido practitioner
Refers to a person who practices aikido, regardless of rank or experience.
彼は合気道家として有名だ。
He is famous as an aikido practitioner.
合気道 is the martial art itself, while 合気道家 refers to a person who practices it.
合気道 (aikido) + 家 (person who does something professionally or as a serious pursuit).