close friend, bosom buddy / crony, chum

虫垂: an appendix (vermiform appendix) / 注水: pouring water / 宙水: subterranean water that collects above a less-permeable stratum: perched water, a perched aquifer / 中水: gray water

抽象: abstraction / 中小: small to medium / 中傷: defamation, slander, libel / 中称: (linguistics) mesioproximal pronoun

中心: center, middle / 衷心: innermost feelings / 忠臣: loyal retainer, loyal subject / 忠信: faithfulness, devotion / 中震: moderate earthquake / 注進: information, making a report

忠助: a male given name

(chiefly women's speech) first person singular pronoun: I, me

(polite) first-person singular pronoun: I, me

a personal or private matter / (by extension) selfishness

(formal) first-person singular pronoun: I, me

personal, private / secret