A software tool or person that creates a concordance, which lists all occurrences of a word in a text with surrounding context.
From concordance + -er (one who does), where concordance comes from Latin concordantia (agreement). The word shifted from referring to agreement to referring to text indexes that 'agree' with your search.
Digital humanists and linguists absolutely love concordancers—these tools can scan millions of words in Shakespeare or the Bible to find every instance of a word and what it appears near, revealing patterns humans would never spot manually.
Complete word intelligence in one call. Free tier — 50 lookups/day.