IPA: /ˈfɔːlsɪfaɪər/
KK: /ˈfɔːlsɪfaɪər/
A person or thing that makes something false or incorrect, often by altering or misrepresenting information.
The investigator discovered that the falsifier had changed the documents to deceive others.
Falsifier → It is formed from "falsus" (meaning false) and "-fier" (from Latin "facere", meaning to make or do). The word refers to someone who makes something false or untrue.
Think of someone who 'makes' ('-fier') something 'false' ('falsus') — that's why a falsifier is someone who creates falsehoods.