sticker vs problem

sticker and problem both are nouns.

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

As nouns, problem is a hypernym of sticker; that is, problem is a word with a broader meaning than sticker:

sticker (noun)	problem (noun)
a short knife with a pointed blade used for piercing or stabbing	a source of difficulty
an adhesive label	a question raised for consideration or solution
a particularly difficult or baffling question or problem	a state of difficulty that needs to be resolved
a small sharp-pointed tip resembling a spike on a stem or leaf