Search API Attachments Facet returning part words
Before I go into to how I solved this; its worth repeating what feed back of this from our hosts. 
'This will happen if you attempt to create a facet for a Solr field of type "text" (which might be the case here), because Solr stems and further processes all words before storing them on the index. There is no direct way to get around this.

Also, faceting on text is not really recommended:

UX-wise, searchers get too much noise, because words come from all over the place--your top facets could be just common words like 'the', 'with', 'you', 'they', etc.

Performance-wise, calculating the facets to show for large fields takes a long time. '

I have got things looking like how I want them though and that was to use 'Facet API BONUS' module. 


Install and Enable Module
Configuration > Search and metadata > Exclude specified items > Add to Exclude items



  Save Configuration


You only get a limited amount of words with this module .  If needed this can be changed by extending the Form in 

Facetapi>filter_exclude_specified_items .
class FacetapiFilterExcludeItems::settingsForm

And adding a '#maxlength'

This is a pretty good blog on adding how to other extended functionality changes to the Facet API module  http://www.trellon.com/content/blog/apachesolr-and-facetapi