Put on an act and Pose as

Pose as and put on an act are semantically related In some cases you can use "Pose as" instead a verb phrase "Put on an act".

Pose as verb - To pretend to be (what one is not) in appearance or behavior.

Put on an act and pose as are semantically related in pretend to be another topic. Sometimes you can use "Put on an act" instead a verb "Pose as".