信友 [－－]

Jyutping seon3 jau5
Pinyin xìn yǒu

Definitions (CC-CANTO)
  1. a penpal [written and colloquial]
Definitions (Wiktionary)
  1. noun, Cantonese
    pen pal
    (syn.) 笔友, 筆友
  2. noun
    the faithful; fellow believer
    (syn.) 教友