poser vs sticker

poser and sticker both are nouns.

Word	Noun	Adjective	Verb	Adverb
poser	Yes	No	No	No
sticker	Yes	No	No	No

As nouns, poser and sticker are synonyms defined as:

poser and sticker: a particularly difficult or baffling question or problem

Other synonyms of poser include stumper, toughie.

poser (noun)	sticker (noun)
a particularly difficult or baffling question or problem	a short knife with a pointed blade used for piercing or stabbing
a person who poses for a photographer or painter or sculptor	an adhesive label
a person who habitually pretends to be something he is not	a particularly difficult or baffling question or problem
	a small sharp-pointed tip resembling a spike on a stem or leaf