I am seeing pairs of words with similar meanings (where one of the words has a
single kanji and the other has two kanji).

Examples include:  
豊か、豊富  
保つ、保存する  
防ぐ、予防する

Do these pair of words share the same meaning? If so, what is the point of
having multiple words with the same meaning?
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2019-02-21T13:51:21.480
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2019-02-21T15:13:50.967
2019-02-21T15:13:50.967
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question
words nuances wago-and-kango
Multiple words with same definition