hinge vs flexible joint

hinge and flexible joint both are nouns.

Word	Noun	Adjective	Verb	Adverb
hinge	Yes	No	Yes	No
flexible joint	Yes	No	No	No

As nouns, hinge and flexible joint are synonyms defined as:

hinge and flexible joint: a joint that holds two parts together so that one can swing relative to the other

hinge (noun)	flexible joint (noun)
a joint that holds two parts together so that one can swing relative to the other	a joint that holds two parts together so that one can swing relative to the other
a circumstance upon which subsequent events depend

hinge (verb)	flexible joint (verb)
attach with a hinge