pyramidal bone vs os triquetrum

pyramidal bone and os triquetrum both are nouns.

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

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

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

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

pyramidal 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