lacuna vs gap

lacuna and gap both are nouns.

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

As nouns, gap is a hypernym of lacuna; that is, gap is a word with a broader meaning than lacuna:

Other hypernyms of lacuna include crack.

lacuna (noun)	gap (noun)
a blank gap or missing part	an act of delaying or interrupting the continuity
	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

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