AMOEBA is validvalid

a unicellular microscopic organism [n AMOEBAE, AMOEBAS] : AMOEBAN [adj], AMOEBIC [adj], AMOEBOID [adj]

15,350 of 196,601 in NWL2023·also valid in CSW24

(Greek) a one-celled animal of ever-changing shape, also AMEBA [n AMOEBAS or AMOEBAE]