aculeus vs prickle

aculeus and prickle both are nouns.

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

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

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

aculeus (noun)	prickle (noun)
a sharp-pointed process especially a sting of a hymenopterous insect	a small sharp-pointed tip resembling a spike on a stem or leaf
a stiff sharp-pointed plant process

aculeus (verb)	prickle (verb)
	make a small hole into, as with a needle or a thorn
	cause a stinging or tingling sensation
	cause a prickling sensation