ContextExpressionSense here
Verse 14لَمْ تَقْرَأْ جَنِينًاA foetus / pregnancy in the camel image
Verse 20إِلَّا جَنِينًاA son interred after death
The root j-n-n has the underlying sense of concealment. An unborn child is hidden in the womb; a dead person may be concealed in the grave. The commentary on verse 20 supports the second sense. Context, not a familiar dictionary gloss alone, determines the translation.