# insider

> English word · Noun · IPA /ɪnˈsaɪdɚ/ · frequency rank #10,066

## Definitions
1. A person who has special knowledge about the inner workings of a group, organization, or institution.
2. A person who is within an enclosed space.

## Etymology
From inside + -er.

## Easily confused with
- **insurer** (https://plainspell.com/en/vs/insider-vs-insurer)
- **insides** (https://plainspell.com/en/vs/insider-vs-insides)
- **invader** (https://plainspell.com/en/vs/insider-vs-invader)
- **inside** (https://plainspell.com/en/vs/inside-vs-insider)
- **infidel** (https://plainspell.com/en/vs/infidel-vs-insider)

## Common misspellings (10)
`inisder`, `innsider`, `insdier`, `insidder`, `insiderr`, `insidre`, `insiedr`, `inssider`, `isnider`, `nisider`

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