extremity vs appendage

extremity and appendage both are nouns.

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

As nouns, extremity and appendage are synonyms defined as:

extremity and appendage: an external body part that projects from the body

Other synonyms of extremity include member.

extremity (noun)	appendage (noun)
an external body part that projects from the body	a part that is joined to something larger
that part of a limb that is farthest from the torso	an external body part that projects from the body
the outermost or farthest region or point	a natural prolongation or projection from a part of an organism either animal or plant
the greatest or utmost degree
an extreme condition or state (especially of adversity or disease)