As nouns the difference between appendage and gnathopodite
is that appendage is an external body part that projects from the body while gnathopodite is any leg-like appendage of a crustacean that is modified to serve as a jaw.
appendage
English
Noun
(
en noun)
an external body part that projects from the body
a natural prolongation or projection from a part of any organism
a part that is joined to something larger
Synonyms
* extremity, member
* outgrowth, process
gnathopodite
English
Noun
(
en noun)
(zoology) Any leg-like appendage of a crustacean that is modified to serve as a jaw.