nephrectomy vs ablation

nephrectomy and ablation both are nouns.

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

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

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

nephrectomy (noun)	ablation (noun)
surgical removal of a kidney	surgical removal of a body part or tissue
	the erosive process that reduces the size of glaciers