leg bone vs femoris

leg bone and femoris both are nouns.

Word	Noun	Adjective	Verb	Adverb
leg bone	Yes	No	No	No
femoris	Yes	No	No	No

As nouns, femoris is a hyponym of leg bone; that is, femoris is a word with a more specific, narrower meaning than leg bone:

leg bone: a bone of the leg
femoris: the longest and thickest bone of the human skeleton; extends from the pelvis to the knee

Other hyponyms of leg bone include femur, thighbone, calf bone, fibula, shin, shin bone, shinbone, tibia.

leg bone (noun)	femoris (noun)
a bone of the leg	the longest and thickest bone of the human skeleton; extends from the pelvis to the knee