saddle vs dorsum

saddle and dorsum both are nouns.

Word	Noun	Adjective	Verb	Adverb
saddle	Yes	No	Yes	No
dorsum	Yes	No	No	No

saddle (noun)	dorsum (noun)
posterior part of the back of a domestic fowl	the back of the body of a vertebrate or any analogous surface (as the upper or outer surface of an organ or appendage or part)
a seat for the rider of a horse or other animal	the posterior part of a human (or animal) body from the neck to the end of the spine
a seat for the rider of a bicycle
a piece of leather across the instep of a shoe
cut of meat (especially mutton or lamb) consisting of part of the backbone and both loins
a pass or ridge that slopes gently between two peaks (is shaped like a saddle)

saddle (verb)	dorsum (verb)
impose a task upon, assign a responsibility to
put a saddle on
load or burden; encumber