Where does “νεκυομαντεία” come from?

νεκυομαντεία (Ancient Greek) comes from Ancient Greek μαντεία, from Ancient Greek -ῐ́ᾱ, from Proto-Indo-European -íh₂, from Proto-Indo-European -h₂ — Creates collective nouns, which refer to groups...

Ancestry of “νεκυομαντεία”, step by step

νεκυομαντεία traces back through two separate lines of ancestry.

via Ancient Greek μαντεία

Step	Language	Word	Meaning
1	Ancient Greek	μαντεία	prophecy, divination, oracle; The power to...
2	Ancient Greek	-ῐ́ᾱ	{{l\|en\|-ia}}; "suffix forming abstract feminine...
3	Proto-Indo-European	-íh₂	—
4	Proto-Indo-European	-h₂	Creates collective nouns, which refer to groups...

via Ancient Greek νέκυς

Step	Language	Word	Meaning
1	Ancient Greek	νέκυς	corpse, dead person; spirits of the dead; dead,...
2	Proto-Indo-European	neḱ-	to perish, disappear

Every word from Proto-Indo-European -h₂ →Every word from Ancient Greek -ῐ́ᾱ →Every word from Ancient Greek μαντεία →