purify vs alter

purify and alter both are verbs.

Word	Noun	Adjective	Verb	Adverb
purify	No	No	Yes	No
alter	No	No	Yes	No

As verbs, alter is a hypernym of purify; that is, alter is a word with a broader meaning than purify:

Other hypernyms of purify include change, modify.

purify (verb)	alter (verb)
remove impurities from, increase the concentration of, and separate through the process of distillation	remove the ovaries of
make pure or free from sin or guilt	become different in some particular way, without permanently losing one's or its former characteristics or essence
become clean or pure or free of guilt and sin	cause to change; make different; cause a transformation
	insert words into texts, often falsifying it thereby
	make an alteration to