expressionless vs poker-faced

expressionless and poker-faced both are adjectives.

Word	Noun	Adjective	Verb	Adverb
expressionless	No	Yes	No	No
poker-faced	No	Yes	No	No

As adjectives, expressionless and poker-faced are synonyms defined as:

Other synonyms of expressionless include deadpan, impassive, unexpressive.

expressionless (adjective)	poker-faced (adjective)
deliberately impassive in manner	deliberately impassive in manner