1 (wiktionary) 2 (zh.wikipedia) 3 (en.wikipedia) 4 (glosbe)

Compounds Expand your vocabulary by studying more complex words built by the 'core words'.

CORE WORDS

HSK 1.0 (1992)
Big5
Gb
Pin
Eng

D
信件

信件

xin4jian4

letter

信  信 trust, believe / letter
件  件 numerary adjunct for article / matter

HSK 2.0 (2010)
Big5
Gb
Pin
Eng

HSK 3.0 (2022)
Big5
Gb
Pin
Eng
7

信件

信件

xìnjiàn
letter (sent by mail)