os hyoideum vs hyoid bone

os hyoideum and hyoid bone both are nouns.

Word	Noun	Adjective	Verb	Adverb
os hyoideum	Yes	No	No	No
hyoid bone	Yes	No	No	No

As nouns, os hyoideum and hyoid bone are synonyms defined as:

os hyoideum and hyoid bone: a U-shaped bone at the base of the tongue that supports the tongue muscles

Other synonyms of os hyoideum include hyoid.

os hyoideum (noun)	hyoid bone (noun)
a U-shaped bone at the base of the tongue that supports the tongue muscles	a U-shaped bone at the base of the tongue that supports the tongue muscles