Tree ID in the Caribbean

Can anybody identify this tree that's growing in my yard in Grenada? Picture attached. Where it's sprouted up, I need a tree to hide the neighbours house so I hope it grows fast! Pictures and thanks...

 

Senna?

 

Thanks Lorax, but no, I googled senna but it doesn't really look like the one in the yard.

 

http://ctfs.si.edu/webatlas/findinfo.php?specid=7567&leng=english
There are dozens of Sennas so you might have to look a long time to find yours.