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Hy Richard, Are you looking to sell plumbing services only or to educate plumbers and also provide training or a place where they can come to learn new skills? If you google plumber the word 'plumbing' here in the UK appears in bold.  So google Rankbrain consider those two words to mean the same thing  So there's no need for AI?  Just a google search.  The intent has been determined by Rankbrain to be equivalent. At least here in the UK anyway.  Please remember to like my answers if you think they're helpful.