sticker vs poser

sticker and poser both are nouns.

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

As nouns, sticker and poser are synonyms defined as:

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

Other synonyms of sticker include stumper, toughie.

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