| Term | Definition |
| appearance / apparently | appear |
| builder / building | build |
| discovery | discover |
| explanation | explain |
| unimportant / importance / importantly | important |
| introduction / introductory | introduce |
| inventor / invention | invent |
| observer / observation | observe |
| impossible / (im)possibility / (im)possibly | impossible |
| psychologist / psychological (ly) | psychology |
| researcher | research |
| revolutionary | revolution |
| scientist / (un)scientific(ally) | science |
| technological(ly) / technical(ly) / technician / technique | technology |
| wooden | wood |
| disallow | allow |
| disassociate / association / (un)associated | associate |
| competition / competitor / competitive(ly) | compete |
| enjoyment / enjayable | enjoy |
| equippment / equipped | equip |
| misfortune / (un)fortunate(ly) | fortune |
| (un)interestting(ly) | interst |
| knowledge / (un)knowkledgeable | know |
| lost / loss | lose |
| maintenance | maintain |
| medallist / medallion | medal |
| opposition / opponent / opposite / opposing | oppose |
| practise (verb) / (im)practical(ly) | practice |
| retrain *** / trainer | train |
| rearrange / arragement | arrange |
| arrival | arrive |
| breadth / broden | broad |
| cultural(ly) / (un)cultured | culture |
| different(ly) / difference | differ |
| indirect / direction / director / (in)directly | direct |
| distantly / distance | distant |
| entrance | enter |
| inhabitant | inhabit |
| (un)ricognisable / recognition | recognise |
| timetable | time |
| tourism / tourist | tour |
| worldwide | world |