| hán | envelope/case/letter |
| 函 | envelope case letter |
| 函人 | armor maker |
| 函件 | letters correspondence |
| 函告 | inform |
| 函售 | selling by mail |
| 函复 | reply |
| 函大 | correspondence university |
| 函子 | [Mathematics] functor |
| 函寄 | send |
| 函式库 | library (partition on computer hard disk) |
| 函授 | to teach by correspondence |
| 函授大学 | correspondence university; correspondence college; OU; Open University |
| 函授学校 | correspondence school |
| 函授教学 | correspondence |
| 函授课程 | correspondence course |
| 函数 | function |
| 函数解析 | [Mathematics] functional analysis |
| 函洽 | To discuss through letters. |
| 函电 | letters and cables; letters and telegrams |
| 函索 | request |