death chair vs electric chair

death chair and electric chair both are nouns.

Word	Noun	Adjective	Verb	Adverb
death chair	Yes	No	No	No
electric chair	Yes	No	No	No

As nouns, death chair and electric chair are synonyms defined as:

death chair and electric chair: an instrument of execution by electrocution; resembles an ordinary seat for one person

Other synonyms of death chair include chair, hot seat.

death chair (noun)	electric chair (noun)
an instrument of execution by electrocution; resembles an ordinary seat for one person	an instrument of execution by electrocution; resembles an ordinary seat for one person