Yes an underlying tag thesaurus would be good. Or tag synonyms as leepowers called (I think) the same idea above. Just to state here a metric for what the end

Yes an underlying tag thesaurus would be good. Or tag synonyms as leepowers called (I think) the same idea above. Just to state here a metric for what the end goal is, whatever method is used would ideally provide the same or a pretty similar hit list for any searches for different synonyms with the same meaning.