sticker vs aculeus

sticker and aculeus both are nouns.

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

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

sticker (noun)	aculeus (noun)
a short knife with a pointed blade used for piercing or stabbing	a sharp-pointed process especially a sting of a hymenopterous insect
an adhesive label	a stiff sharp-pointed plant process
a particularly difficult or baffling question or problem
a small sharp-pointed tip resembling a spike on a stem or leaf