Silent का use adjective की तरह किया जाता है।
He spoke no English and was completely silent during the visit.
He was a serious, silent man.
She offered a silent prayer of thanks.
Silence का use noun या verb की तरह किया जाता है।
A ringing phone silenced her. (verb)
The shock silenced him completely. (verb)
They stood in silence. (noun)
His silence was worse than his anger. (noun)
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Silently सीखें - Silent और silence के बीच का अंतर: by Taruna ma'am