• nsdoss,
• ksdoss,
• jsdoss,
• mzdoss,
• mxdoss,
• mddoss,
• mwdoss,
• mssoss,
• msxoss,
• msfoss,
• msross,
• mseoss,
• msdiss,
• msdkss,
• msdlss,
• msd0ss,
• msd9ss,
• nmsdoss,
• mssdoss,
• msdosss

The plural form of "msdoss" is "msdoss" as it is an acronym for Microsoft Disk Operating System. Acronyms generally do not change in their plural form.

The singular form of the word "msdoss" is "msdos"