noun
prolific writer; ready writer
Refers to a writer who produces a large volume of work or writes with ease and fluency. Often used in literary or journalistic contexts.
彼は健筆家として知られ、毎年数冊の本を出版している。
He is known as a prolific writer, publishing several books every year.
その健筆家は新聞に毎日コラムを寄稿している。
That ready writer contributes a column to the newspaper every day.
文筆家 is a broader term for a person engaged in writing as a profession, without the nuance of being especially prolific.
Compound of 健 (healthy, vigorous) + 筆 (writing brush) + 家 (person), literally 'person of vigorous brush'. The exact historical derivation is uncertain, but the term has been used since at least the Meiji period to describe prolific writers.