# PCT vs PF

> English confusable word pair

## The two words

### PCT
*name · frequency rank #23,938*
Initialism of Patent Cooperation Treaty.

### PF
*noun · frequency rank #16,301*
Initialism of pilot flying, a pilot currently in control of the flight trajectory of the aircraft, as opposed to pilot monitoring.

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