Samskritam etymology - words with ख Kha (space) as the root

ख Kha means space in Samskritam.

This leads to words: 

सखा Sakha(same space-male friend)

सखि Sakhi (same space-female friend)

सुख Sukha (good space-comfort)

दुःख Dukha (bad space-worry)

खग Khaga (that which travels across space meaning a bird or the sun)