aculeus vs sticker

aculeus and sticker both are nouns.

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

As nouns, sticker is a hyponym of aculeus; that is, sticker is a word with a more specific, narrower meaning than aculeus:

Other hyponyms of aculeus include pricker, prickle, spikelet, spine, thorn.

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