# VD vs vi

> English confusable word pair

## The two words

### VD
*noun · frequency rank #41,942*
The design diving speed of an aircraft; the highest speed which the aircraft is planned to reach during flight testing. Always higher than VNE (the speed that must not be exceeded in service).

### vi
*noun · IPA /ˌviː ˈaɪ/ · frequency rank #6,199*
Initialism of verb intransitive or intransitive verb, often in dictionaries.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/vs/vd-vs-vi