triquetral bone vs os triquetrum

triquetral bone and os triquetrum both are nouns.

Word	Noun	Adjective	Verb	Adverb
triquetral bone	Yes	No	No	No
os triquetrum	Yes	No	No	No

As nouns, triquetral bone and os triquetrum are synonyms defined as:

triquetral bone and os triquetrum: a wrist bone that articulates with the pisiform and hamate and lunate bones

Other synonyms of triquetral bone include cuneiform bone, pyramidal bone, triquetral.

triquetral bone (noun)	os triquetrum (noun)
a wrist bone that articulates with the pisiform and hamate and lunate bones	a wrist bone that articulates with the pisiform and hamate and lunate bones