| 1 | English | endogen | A plant which increases in size by internal... |
| 2 | English | Gen | A member of the Gen Movement, a youth expression... |
| 3 | English | again | Another time; once more; Over and above a factor... |
| 4 | Middle English | agayn | again |
| 5 | Old English | onġēan | — |
| 6 | Old English | on- | forming verbs and adjectives from participles and... |
| 7 | Old English | and- | against, opposing; in return, back; facing,... |
| 8 | Proto-West Germanic | anda- | against, opposing; in return, back; facing,... |
| 9 | Proto-Germanic | anda- | against, opposing; un-, de- |
| 10 | Proto-Indo-European | h₂énti | opposite; near; in front |
| 11 | Proto-Indo-European | h₂énts | forehead; front |
| 12 | Proto-Indo-European | h₂ent- | face; forehead; front |
| 13 | Proto-Indo-European | h₂en- | on, onto |