The following differently hyphenated words have been left as they were, since there was no clearly predominant usage.
| air-lock | airlock |
| food-stuff | foodstuffs |
| ice-caps | icecaps |
| moon-dust | moondust |
| re-broadcast | rebroadcast |
| roof-tops | rooftops |
| side-rail | siderail |
| space-ship | spaceship |
| tree-tops | treetops |
| ultra-violet | ultraviolet |
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