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portmanteau
In some linguistics fiels, and also to an extent in common usage, a portmanteau word (sometimes just portmanteau) is a term used to describe a word that fuses two or more function words.
Trivia about portmanteau
This type of word is a blend of 2 others, like smog from smoke & fog
From the French for "to carry", it's a large suitcase that opens into 2 hinged compartments
Oui! Lewis Carroll came up with this 11-letter term for a blended word like smog from smoke & fog