falsify vs alter

falsify and alter both are verbs.

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

As verbs, falsify and alter are synonyms defined as:

Other synonyms of falsify include interpolate.

falsify (verb)	alter (verb)
falsify knowingly	remove the ovaries of
insert words into texts, often falsifying it thereby	become different in some particular way, without permanently losing one's or its former characteristics or essence
prove false	cause to change; make different; cause a transformation
make false by mutilation or addition; as of a message or story	insert words into texts, often falsifying it thereby
tamper, with the purpose of deception	make an alteration to