gap vs diastema

gap and diastema both are nouns.

Word	Noun	Adjective	Verb	Adverb
gap	Yes	No	Yes	No
diastema	Yes	No	No	No

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

gap (noun)	diastema (noun)
an act of delaying or interrupting the continuity	a gap or vacant space between two teeth
a narrow opening
a conspicuous disparity or difference as between two figures
a difference (especially an unfortunate difference) between two opinions or two views or two situations
an open or empty space in or between things
a pass between mountain peaks; geomorphological term for the lowest point on a mountain ridge between two peaks

gap (verb)	diastema (verb)
make an opening or gap in