sphenoid bone vs sphenoid

sphenoid bone and sphenoid both are nouns.

Word	Noun	Adjective	Verb	Adverb
sphenoid bone	Yes	No	No	No
sphenoid	Yes	No	No	No

As nouns, sphenoid bone and sphenoid are synonyms defined as:

sphenoid bone and sphenoid: butterfly-shaped bone at the base of the skull

Other synonyms of sphenoid bone include os sphenoidale.

sphenoid bone (noun)	sphenoid (noun)
butterfly-shaped bone at the base of the skull	butterfly-shaped bone at the base of the skull