subfigure vs facet

subfigure and facet both are nouns.

Word	Noun	Adjective	Verb	Adverb
subfigure	Yes	No	No	No
facet	Yes	No	No	No

As nouns, facet is a hyponym of subfigure; that is, facet is a word with a more specific, narrower meaning than subfigure:

Other hyponyms of subfigure include flank, hemisphere, branch, leg, ramification.

subfigure (noun)	facet (noun)
a figure that is a part of another figure	a distinct feature or element in a problem
	a smooth surface (as of a bone or cut gemstone)