Create Word Automation Service Application using PowerShell in SharePoint 2016

Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue

#Configuration Parameters
$ServiceAppName = "Word Automation Service Application"
$AppPoolName = "Service Application App Pool"
$AppPoolAccount = "Crescent\SP16-ServiceAppPool"
$DBName = "SP16_WordAutomation_ServiceApp"
$DBServer="SP16-SQL"

Try {
    #Set the Error Action
    $ErrorActionPreference = "Stop"
  
    #Check if Managed account is registered already
    Write-Host -ForegroundColor Yellow "Checking if the Managed Accounts already exists..."
    $AppPoolAccount = Get-SPManagedAccount -Identity $AppPoolAccount -ErrorAction SilentlyContinue
    if($AppPoolAccount -eq $null)
    {
        Write-Host "Please Enter the password for the Service Account..."
        $AppPoolCredentials = Get-Credential $AppPoolAccount
        $AppPoolAccount = New-SPManagedAccount -Credential $AppPoolCredentials
    }
  
    #Check if the application pool exists already
    Write-Host -ForegroundColor Yellow "Checking if the Application Pool already exists"
    $AppPool = Get-SPServiceApplicationPool -Identity $AppPoolName -ErrorAction SilentlyContinue
    if ($AppPool -eq $null)
    {
        Write-Host -ForegroundColor Green "Creating Application Pool..."
        $AppPool = New-SPServiceApplicationPool -Name $AppPoolName -Account $AppPoolAccount
    }
  
    #Check if the Service application exists already
    Write-Host -ForegroundColor Yellow "Checking if Word Automation  Service Application exists already"
    $ServiceApplication = Get-SPServiceApplication -Name $ServiceAppName -ErrorAction SilentlyContinue
    if ($ServiceApplication -eq $null)
    {
        #There is no New-SPWordConversionServiceApplicationProxy, we can't therefore set it's name
        #The -default parameter adds the automatically created proxy to the default proxy group
        Write-Host "Creating $ServiceAppName Application & Proxy..."
        $ServiceApp = New-SPWordConversionServiceApplication -Name $ServiceAppName -ApplicationPool $AppPoolName -DatabaseName $DBName -DatabaseServer $DBServer -Default
    }
    
    #Start Service Instance(s)
    Write-Host -ForegroundColor Yellow "Starting the Word Automation Service Instance..."
    $ServiceInstance = Get-SPServiceInstance | where-object {$_.TypeName -eq "Word Automation Services"} | Start-SPServiceInstance
    
    Write-Host "Word Automation Service Application Created successfully!" -ForegroundColor Green
}
catch {
    Write-Host $_.Exception.Message -ForegroundColor Red
 }
 finally {
    #Reset the Error Action to Default
    $ErrorActionPreference = "Continue"
 }