# SPF

> English word · Noun · frequency rank #30,978

## Definitions
1. Initialism of sun protection factor.
2. Initialism of single point of failure.
3. Initialism of spray polyurethane foam.
4. Initialism of spruce-pine-fir, mixed softwood timber.

## Easily confused with
- **SS** (https://plainspell.com/en/vs/spf-vs-ss)
- **su** (https://plainspell.com/en/vs/spf-vs-su)
- **SW** (https://plainspell.com/en/vs/spf-vs-sw)
- **SV** (https://plainspell.com/en/vs/spf-vs-sv)
- **Sy** (https://plainspell.com/en/vs/spf-vs-sy)
- **sun** (https://plainspell.com/en/vs/spf-vs-sun)
- **sub** (https://plainspell.com/en/vs/spf-vs-sub)
- **sum** (https://plainspell.com/en/vs/spf-vs-sum)
- **spy** (https://plainspell.com/en/vs/spf-vs-spy)
- **sue** (https://plainspell.com/en/vs/spf-vs-sue)
- **SUV** (https://plainspell.com/en/vs/spf-vs-suv)
- **sup** (https://plainspell.com/en/vs/spf-vs-sup)
- **STD** (https://plainspell.com/en/vs/spf-vs-std)
- **SQL** (https://plainspell.com/en/vs/spf-vs-sql)
- **STA** (https://plainspell.com/en/vs/spf-vs-sta)
- **STR** (https://plainspell.com/en/vs/spf-vs-str)
- **STS** (https://plainspell.com/en/vs/spf-vs-sts)
- **Stu** (https://plainspell.com/en/vs/spf-vs-stu)
- **SSD** (https://plainspell.com/en/vs/spf-vs-ssd)
- **ssh** (https://plainspell.com/en/vs/spf-vs-ssh)

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/spf