This is the 1790th most frequent German word.
lugner
"Lügner" means "liar" in English.
The word 'Lügner' is used as a noun to describe someone's character trait of being dishonest.
Er ist ein unverbesserlicher Lügner.
He is an incorrigible liar.
Here, 'Lügner' is a subject noun, identifying the teller of the story.
Die Geschichte, die der Lügner erzählt hat, war voller Widersprüche.
The story told by the liar was full of contradictions.
In this case, 'Lügner' functions as the object noun representing the person being referred to.