The Latin word nepōs
Word nepōs
Meaning grandson, nephew
See also Proto-Indo-European: *népōts ‘grandson, nephew’
Etruscan: nefts ‘nephew, grandson’
Avestan: napāt- ‘grandson’
Sanskrit: nápāt- ‘descendant, offspring, grandson’

Other words that might be of interest
levir ‘brother in law’, avus ‘grandfather’, fēmina ‘woman’, vir ‘man’, homō ‘man, human being’, puer ‘child’, uxor ‘wife’, mulier ‘wife’, maritus ‘husband’, māter ‘mother’, pāter ‘father’, abbas ‘father’, atavus ‘great grandfather, ancestor’, glōs ‘sister in law’