tennis: a game played with rackets by two or four players who hit a ball back and forth over a net that divides the court
entity: that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
helvella sulcata: a helvella with an irregularly convoluted cap that is dark brown when young and becomes dull grey with age; the lower surface of the cap is smooth and pale grey; the stalk is thick and deeply fluted