There are some very confusing pairs of words in English language which have very different meanings from each other.

Poser as noun:

In English language poser is used as a noun which means someone who poses or stands or sits in a specific manner.

Example:

She is a natural poser, all her pictures are wonderful.

Poser is also used as a noun to represent a perplexing situation or issue.

Example:

He is dealing with a poser right now.

Poseur as noun:

Poser’s confusing half poseur is also used as a noun in English language which represents a person or someone who behaves in a good manner to impress others.

Example:

He is a poseur when in reality he has a cruel heart.