an alphabetical list of words relating to a specific subject, text, or dialect.
Ad Relevancy states how relevant an ad is to the customer searches. The relevancy of an ad can be increased by adding keywords in the ad headline/description/display URL and on the landing page. The more relevant an ad is to the customer searches, the higher will be the quality score that's achieved. This leads to an increased ad position and RoI with low spent/CPC.