You can hide or unhide words either within Word Preview or by tapping on the Explore tab:
Word Preview:
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Tap on the up arrow (bottom left corner) after a word is introduced.
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Tap on the three dots (...) next to the word you would like to hide or unhide.
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Tap on the eye icon to hide or unhide the desired word.
Explore tab :
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Tap on the "Explore" tab, select the desired "Category" and "Topic" and tap on the word you would like to hide or unhide.
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Tap on the eye icon to hide or unhide the word.
Updated