The male lioness is a Lion. The species is Lion. It is the largest member of the Cat family.
The primary physical difference between Lions and Lionesses (aside from the reproductive organs) is that the lion has a mane, and the lioness does not.
Lions are the second largest cat, the tiger is the largest.
The largest Lion in captivity weighed 930 lbs. The largest Tiger in captivity weighed 932 lbs, making the Tiger slightly heavier. However, the Lion has more Muscle mass, which means it is Stronger than the Tiger, and looks slightly larger.
Peter Jackson, Big Cat Expert
The heaviest Confirmed Napalese tiger weighed 227 kg. The heaviest Confirmed Tsavo Lion weighed 272 kg.
Mazak, Big Cat Expert