Where does “ῠ̔μνῳδός” come from?

ῠ̔μνῳδός (Ancient Greek) comes from Ancient Greek ᾰ̓οιδή, from Ancient Greek ᾰ̓είδω — to sing.

Ancestry of “ῠ̔μνῳδός”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	ᾰ̓οιδή	—
2	Ancient Greek	ᾰ̓είδω	to sing

ῠ̔μνῳδός — Etymology, Origin & Word History | Etymology Explorer