LACUNA is validvalid

an empty space or missing part [n LACUNAE, LACUNAS] : LACUNAL [adj], LACUNARY [adj], LACUNATE [adj]

22,772 of 196,601 in NWL2023·also valid in CSW24

(Latin) an empty space or missing part, also LACUNE [n LACUNAS or LACUNAE]