frontal suture vs suture

frontal suture and suture both are nouns.

Word	Noun	Adjective	Verb	Adverb
frontal suture	Yes	No	No	No
suture	Yes	No	Yes	No

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

frontal suture: the suture between two halves of the frontal bone (usually obliterated by the age of 6)
suture: an immovable joint (especially between the bones of the skull)

Other hypernyms of frontal suture include fibrous joint, sutura.

frontal suture (noun)	suture (noun)
the suture between two halves of the frontal bone (usually obliterated by the age of 6)	thread of catgut or silk or wire used by surgeons to stitch tissues together
	a seam used in surgery
	an immovable joint (especially between the bones of the skull)

frontal suture (verb)	suture (verb)
	join with a suture