fibrous joint vs sutura

fibrous joint and sutura both are nouns.

Word	Noun	Adjective	Verb	Adverb
fibrous joint	Yes	No	No	No
sutura	Yes	No	No	No

As nouns, fibrous joint and sutura are synonyms defined as:

fibrous joint and sutura: an immovable joint (especially between the bones of the skull)

Other synonyms of fibrous joint include suture.

fibrous joint (noun)	sutura (noun)
an immovable joint (especially between the bones of the skull)	an immovable joint (especially between the bones of the skull)