English words for 'have a firm understanding or knowledge of; be on top of'

As you may have noticed, above you will find words for "have a firm understanding or knowledge of; be on top of". Hover the mouse over the word you'd like to know more about to view its definition. Click search related words by phrase or description. to find a better fitting word. Finally, thanks to ChatGPT, the overall results have been greatly improved.

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