tonsillectomy vs ablation

tonsillectomy and ablation both are nouns.

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

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

tonsillectomy: surgical removal of the palatine tonsils; commonly performed along with adenoidectomy
ablation: surgical removal of a body part or tissue

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

tonsillectomy (noun)	ablation (noun)
surgical removal of the palatine tonsils; commonly performed along with adenoidectomy	surgical removal of a body part or tissue
	the erosive process that reduces the size of glaciers