Vacuole :  (noun)

1: a tiny cavity filled with fluid in the cytoplasm of a cell

Golgi apparatus, aster, basal body, cell membrane, central apparatus, central body, centriole, centroplasm, centrosome, centrosphere, chloroplast, chromoplast, cilia, cytocentrum, flagella, kinoplasm, microbody, microcentrum, mitochondrion, pili, plasmodesmata, plastid, plastosome, ribosome, spherosome, spindle fibers,