mastectomy vs ablation

mastectomy and ablation both are nouns.

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

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

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

mastectomy (noun)	ablation (noun)
surgical removal of a breast to remove a malignant tumor	surgical removal of a body part or tissue
	the erosive process that reduces the size of glaciers