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It is normally called a compound word (grandfather, daytime, footstool).

The word portmanteau applies when a combination of words is altered in form, such as smog for smoke and fog.

The term contractions is used for joined words where one or more letters is omitted, such as is not = isn't, are not= aren't or did not = didn't.

Words may also be hyphenated as in compound adjectives such as little-known.

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12y ago

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