sigmoidectomy vs ablation

sigmoidectomy and ablation both are nouns.

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

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

sigmoidectomy: surgical removal of part or all of the sigmoid colon (usually to remove a malignant tumor)
ablation: surgical removal of a body part or tissue

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

sigmoidectomy (noun)	ablation (noun)
surgical removal of part or all of the sigmoid colon (usually to remove a malignant tumor)	surgical removal of a body part or tissue
	the erosive process that reduces the size of glaciers