Use the last letter

[TheRiddler]

Etatism.

 

[Barbas]

Madras.

 

[TheRiddler]

Sardonic.

 

[Barbas]

Carcinogenic.

 

[TheRiddler]

Cinematography.

 

[Barbas]

Yucatan.

 

[TheRiddler]

Natal.

 

[Barbas]

Luger.

 

[RedDeadFred]

Regurgitate.

 

[Barbas]

Erroneous.

 

[Scarim Coral]

Shade

 

[Barbas]

Entmoot.

 

[TheRiddler]

Tooth.

 

[Barbas]

Hapsburg.

 

[Rabbitboy]

Groot.

 

[Barbas]

Teapot.

 

[TheRiddler]

Topaz.

 

[Barbas]

Zipper.

 

[Fijiman]

responsible

 

[Barbas]

Emblem.