extremity vs dactyl

extremity and dactyl both are nouns.

Word	Noun	Adjective	Verb	Adverb
extremity	Yes	No	No	No
dactyl	Yes	No	No	No

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

extremity: an external body part that projects from the body
dactyl: a finger or toe in human beings or corresponding body part in other vertebrates

Other hyponyms of extremity include chelicera, mouthpart, fang, chela, claw, nipper, pincer, parapodium, fin, pleopod, swimmeret, limb, digit.

extremity (noun)	dactyl (noun)
an external body part that projects from the body	a finger or toe in human beings or corresponding body part in other vertebrates
that part of a limb that is farthest from the torso	a metrical unit with stressed-unstressed-unstressed syllables
the outermost or farthest region or point
the greatest or utmost degree
an extreme condition or state (especially of adversity or disease)