bicycle seat vs saddle

bicycle seat and saddle both are nouns.

Word	Noun	Adjective	Verb	Adverb
bicycle seat	Yes	No	No	No
saddle	Yes	No	Yes	No

As nouns, bicycle seat and saddle are synonyms defined as:

bicycle seat (noun)	saddle (noun)
a seat for the rider of a bicycle	posterior part of the back of a domestic fowl
	a seat for the rider of a horse or other animal
	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)

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