| français | fra-000 |
| diphtonguer | |
| Universal Networking Language | art-253 | diphthongize(icl>switch>do,agt>person,obj>sound) |
| català | cat-000 | diftongar |
| ελληνικά | ell-000 | διφθογγίζω |
| English | eng-000 | diphthongize |
| Esperanto | epo-000 | diftongi |
| Ido | ido-000 | diftongeskar |
| italiano | ita-000 | dittongare |
| 日本語 | jpn-000 | 二重母音化する |
| occitan | oci-000 | diftongar |
| português | por-000 | ditongar |
| русский | rus-000 | дифтонгизировать |
| español | spa-000 | diptongar |