acuity vs steel trap

acuity and steel trap both are nouns.

Word	Noun	Adjective	Verb	Adverb
acuity	Yes	No	No	No
steel trap	Yes	No	No	No

As nouns, steel trap is a hyponym of acuity; that is, steel trap is a word with a more specific, narrower meaning than acuity:

acuity: a quick and penetrating intelligence
steel trap: an acute intelligence (an analogy based on the well-known sharpness of steel traps)

acuity (noun)	steel trap (noun)
a quick and penetrating intelligence	a trap made of steel with a strong spring and sharp toothlike projections to hold the prey
sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart)	an acute intelligence (an analogy based on the well-known sharpness of steel traps)