Inspired by Tom Scott's Basics video on longest word you can create with a seven segment display. This version gets all of the longest, not just first of the longest and is lax on what letters count, allowing S and O. It also gets the word list from github, just in case any new words are invented.

Get-LongestSevenSegment.ps1

$Words = (invoke-webrequest -uri https://raw.githubusercontent.com/dwyl/english-words/master/words_alpha.txt).content -split ("`n")
<# Or If you have already downloaded the list
$Words = Get-Content -Path .\words_alpha.txt
#>
[regex]$NonLetters = "[gkmqvwxyz]"

$LongestWords = @()

foreach ($Word in $Words)
{
    if ($Word -notmatch $NonLetters)
    {
        if ($word.length -eq $LongestWords[-1].length)
        {
            $LongestWords += $Word
        }
        elseif ($word.length -gt $LongestWords[-1].length) 
        {
            $LongestWords = @()
            $LongestWords += $Word
        }
    }
}

$LongestWords
$LongestWords[-1].Length