Hi,
I think what you are looking for are synonym rules like this:
dog, cat, bird => animal
I think the following link can be interesting to you as well:
http://wisdombase.net/wiki/index.php?title=Hiearchy_synonym_search_solution_in_solr
I am not a Solr expert but speaking about Lucene synonyms
If I understood correctly, this seems you are wanting facets/hierarchical
facets.
Regds
Pravesh
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