The Spar is the supporting beam that runs through the "center" of the wing from one side to the other. It gives the wing it's strength.

Swept wing is a wing that angles back from the center to the tip.. meaning it is not straight out from the fuselage, but is "swept back" from the fuselage rearwards with the tip somewhat behind.

Teardrop shaped wing, well, that's a horse of a different color.. perhaps a bit more advaced for here, but there is a different name for it, more technical, but I can't remember what that is.. someone I'm sure will chime in with that info.

CGr.