1. (noun) a person who habitually pretends to be something he is not

• poseur

2. (noun) a person who poses for a photographer or painter or sculptor

• model

3. (noun) a particularly difficult or baffling question or problem

• sticker
• stumper
• toughie

1. (noun) a person who habitually pretends to be something he is not

• poseuse

2. (noun) a person who poses for a photographer or painter or sculptor

• artist's model
• sitter
• dressmaker's model
• photographer's model

1. (noun) a person who habitually pretends to be something he is not

• exhibitionist
• show-off

2. (noun) a person who poses for a photographer or painter or sculptor

• assistant
• help
• helper
• supporter

3. (noun) a particularly difficult or baffling question or problem

• problem

1. (noun) a person who habitually pretends to be something he is not

• impersonate
• personate
• pose

2. (noun) a person who poses for a photographer or painter or sculptor

• model
• model
• pose
• pose
• posture
• posture
• sit
• sit

3. (noun) a particularly difficult or baffling question or problem

• amaze
• baffle
• beat
• bewilder
• dumbfound
• flummox
• get
• gravel
• mystify
• nonplus
• perplex
• pose
• puzzle
• stick
• stupefy
• vex
• mix up
• stump