lamboid suture vs fibrous joint

lamboid suture and fibrous joint both are nouns.

Word	Noun	Adjective	Verb	Adverb
lamboid suture	Yes	No	No	No
fibrous joint	Yes	No	No	No

As nouns, fibrous joint is a hypernym of lamboid suture; that is, fibrous joint is a word with a broader meaning than lamboid suture:

lamboid suture: the suture between the occipital and parietal bones
fibrous joint: an immovable joint (especially between the bones of the skull)

Other hypernyms of lamboid suture include sutura, suture.

lamboid suture (noun)	fibrous joint (noun)
the suture between the occipital and parietal bones	an immovable joint (especially between the bones of the skull)