| 底子 | dǐ zi | base / foundation / bottom | 
| 底 | de | (equivalent to 的 as possessive particle) | 
| 底 | dǐ | bottom; base / background; foundation / copy (of a manuscript or receipt etc) kept as a record / (suffix) end of a year or month / (math.) radix; base (abbr. for 底数) | 
| 子 | zǐ | son / child / seed / egg / small thing / 1st earthly branch: 11 p.m.–1 a.m., midnight, 11th solar month (7th December to 5th January), year of the rat / viscount, fourth of five orders of nobility 五等爵位 / ancient Chinese compass point: 0° (north) / subsidiary; subordinate; (prefix) sub- | 
| 子 | zi | noun suffix, as in 椅子 "chair" |