Excel addon to group keywords based on common terms

Does anybody knows of a formular or addon for Excel where I can use it to sort and group keywords based on common terms?
For example if I have a keyword list like the following:
boot cd
boot cd rom
cmos boot disk
boot failure
boot failure xp
bootable cd
boot dos ms
bootable disk recovery
I want to be able to group those keywords into two groups, each contains a general term.
(boot)
boot cd
boot cd rom
cmos boot disk
boot failure
boot failure xp
(bootable)
bootable cd
bootable disk recovery
Any help is appreciated.

See original post by gaman