One who accrues; something that accumulates or causes something to accumulate, though this is a rare word form.
From 'accrue' plus the agent noun suffix '-er', meaning one who performs the action. This is an uncommon word formation; usually 'accrue' is used with human subjects rather than a named agent.
This word is so rare that most English speakers have never encountered it—but technically, a savings account could be called an 'accruer' of wealth!
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