IPA: /bɪˈhɛdə/
KK: /bɪˈhɛdər/
A person who cuts off the head of someone or something.
The beheader was known for his brutal methods during the war.
Beheader → It is formed from "be-" (meaning to cause to be or to make) and "head" (from Old English "heafod", meaning the upper part of the body or the head) and "-er" (meaning a person who). The word "beheader" refers to a person who causes the act of beheading, or making someone headless.
Think of someone who 'makes' ('be-') someone 'headless' ('head') — that's why a beheader is a person who beheads.