forgery vs falsification

forgery and falsification both are nouns.

Word	Noun	Adjective	Verb	Adverb
forgery	Yes	No	No	No
falsification	Yes	No	No	No

As nouns, falsification is a hypernym of forgery; that is, falsification is a word with a broader meaning than forgery:

forgery: criminal falsification by making or altering an instrument with intent to defraud
falsification: the act of rendering something false as by fraudulent changes (of documents or measures etc.) or counterfeiting

Other hypernyms of forgery include falsehood, crime, criminal offence, criminal offense, law-breaking.

forgery (noun)	falsification (noun)
criminal falsification by making or altering an instrument with intent to defraud	the act of rendering something false as by fraudulent changes (of documents or measures etc.) or counterfeiting
a copy that is represented as the original	the act of determining that something is false
	a willful perversion of facts
	any evidence that helps to establish the falsity of something