窿 窿 long2
cavity; hole

strokes 16
radical
穴
穴
strokes after radical 12
大耳窿 大耳窿 da4 er3 long2
loan shark; usurer

窟窿 窟窿 ku1 long5
hole; pocket; cavity; loophole; debt

窟窿眼 窟窿眼 ku1 long5 yan3
small hole

穹窿 穹窿 qiong2 long2
a dome; a vault; the sky