endarterectomy vs ablation

endarterectomy and ablation both are nouns.

Word	Noun	Adjective	Verb	Adverb
endarterectomy	Yes	No	No	No
ablation	Yes	No	No	No

As nouns, ablation is a hypernym of endarterectomy; that is, ablation is a word with a broader meaning than endarterectomy:

endarterectomy: surgical removal of the inner lining of an artery that is clogged with atherosclerosis
ablation: surgical removal of a body part or tissue

Other hypernyms of endarterectomy include cutting out, excision, extirpation.

endarterectomy (noun)	ablation (noun)
surgical removal of the inner lining of an artery that is clogged with atherosclerosis	surgical removal of a body part or tissue
	the erosive process that reduces the size of glaciers