Broad match not allowed for some keywords?

I can't modify keyword type

[spaidermen]

I am bidding for some keyword with exact match i wanted to switch to broad match but the option is not tickable...
Are there "blocked" keywords?

[webdiversity]

All single word keywords can not be broad or phrase matched, so widgets on it's own will not do the biz.

[spaidermen]

Thanks.
Sorry, I had misread this post that explained it
[webmasterworld.com...]