I'm not sure exactly what you're asking for.
Code:
; [Shift]+[backspace] to delete word (chars up to the first space to the left)
$+BS::Send, {blind}^{Left}{BS} ; [ctrl]+[shift]+[left/right] = select chars up to space ('right' includes the space, 'left' doesn't)
; [Shift]+[del] to delete word (chars up to and including the first space to the right)
$+Del::Send, {blind}^{Right}{BS}
This *should* work. If you're having trouble, please give more information about what isn't working and about what you've tried to get it to work.
btw: recent experimentation has lead me to discover that [shift][del] is the same as 'cut' (or [ctrl][v]). I didn't know that before
[edit:] typo