• 副ふく

  assistant, associate, vice-, sub-, deputy, substitute, auxiliary, supplementary, additional, collateral

• 副詞ふくし

  adverb

• 副題ふくだい

  subtitle, subheading

• 副業ふくぎょう

  side job, sideline, subsidiary business

• 副賞ふくしょう

  supplementary prize, additional prize, auxiliary prize, bonus prize

• 副社長ふくしゃちょう

  executive vice-president

• 副作用ふくさよう

  side effect, adverse reaction

• 副知事ふくちじ

  vice-governor, deputy governor, lieutenant governor

• 副葬品ふくそうひん

  grave goods, burial accessories

• 副反応ふくはんのう

  side effect (of a vaccine)

• 副産物ふくさんぶつ

  by-product

• 副層ふくそう

  sublayer

• 副尺ふくしゃく

  vernier

• 副子ふくし

  splint, brace

• 副王ふくおう

  viceroy, vice-king

• 副木ふくぼく

  splint, brace

• 副書ふくしょ

  copy, duplicate

• 副本ふくほん

  duplicate, copy

• 副因ふくいん

  secondary cause

• 副署ふくしょ

  countersignature

• 副手ふくしゅ

  assistant, associate

• 副虹ふくにじ

  secondary rainbow

• 副官ふくかん

  adjutant, aide, aide-de-camp

• 副生ふくせい

  byproduct, secondary product

• 副使ふくし

  vice-envoy, deputy delegate

• 副編ふくへん

  associate editor, deputy editor

• 副審ふくしん

  assistant umpire, assistant referee

• 副腎ふくじん

  suprarenal body, adrenal glands

• 副食ふくしょく

  side dish, supplementary food

• 副菜ふくさい

  side dish (e.g. vegetables, beans, pickles)

• 副砲ふくほう

  secondary armament (of a warship), secondary battery, secondary gun

• 副鏡ふくきょう

  secondary mirror (in a reflecting telescope)

• 副葬ふくそう

  burying a dead person's personal belongings with the body

• 副垢ふくアカ

  secondary account (on social media, etc.), second account, extra account, backup account

• 副寺ふうす

  one of the six administrators of a Zen temple (in charge of accounting)

• 副長ふくちょう

  deputy head, deputy director, vice chief (of something)

• 副露フーロ

  calling another player's discarded tile to complete a meld (but not to complete one's hand)

• 副文ふくぶん

  addendum (to a treaty or contract), annex, annexure, appendix, subsidiary clause

• 副将ふくしょう

  second in command (of an army)

• 関副かんふく

  relative adverb

• 正副せいふく

  original and copy (of a document)

• 副次的ふくじてき

  secondary

• 副詞的ふくしてき

  adverbial

• 副睾丸ふくこうがん

  epididymis

• 副領事ふくりょうじ

  vice-consul

• 副器官ふくきかん

  accessory organ

• 副要求ふくようきゅう

  subrequest

• 副議長ふくぎちょう

  vice-chairman

• 副大臣ふくだいじん

  vice minister

• 副総裁ふくそうさい

  vice president