Because my window is open

Does anyone know the difference between "omdat" and "want?" Don't they both mean "because?" Also, there is a woman who hangs out on a patio under my window most of the time speaking something that sounds like Tagalog. Her life must be really funny because (omdat/want?) she's constantly laughing. Her laugh sounds exactly like the laugh of that garden party guest in Jaques Tati's "Mon Oncle." It's unnerving. The soundtrack of my life this week has been my own cough, her laugh, and the wind rustling the new leaves on the trees.