List of diminutives ending with -o

• aggro
• ammo
• cheerio
• combo
• convo
• demo
• favo
• journo
• kiddo
• nutso
• preggo
• sicko
• whammo
• weirdo

They're formed by shortening a longer word and adding an o (in contrast with condo, Lambo, psycho where the o pronunciation is part of the original word; or with lingo which is Latin lingua + o.)

I wonder, for some of them, just how broadly they would be understood.

Australian English is said to be pretty productive with this. My impression is that a word such as convo would be easily understood by Ozzies, but not necessarily by, say, Americans.

See also

• DailyWritingTips mentions arvo, doggo, muso.
• Wiktionary offers Category:English words suffixed with -o.
• TODO(): add link to our notes about naming a product or business, once they're online.