This is the 3716th most frequent Japanese word.
がく
"がく" (gaku) can mean "frame," "amount," or "study," depending on context.
The word '学' (gaku) in '学ぶ' (manabu) serves as a root meaning 'study' or 'learn'.
学ぶことは楽しいです。
Learning is enjoyable.
'学' (gaku) here represents 'knowledge' and is used as a standalone noun.
子供たちは学校で学を収めます。
Children acquire knowledge at school.
In this sentence, '学' (gaku) is part of '学者' (gakusha), meaning 'scholar', reflecting the academic or scholarly context.