... Stop words are not contained in the tsvector column type. Words like 'as', 'a', 'while', and 'is' are thrown out by the tsearch parser. The default tsearch parser performs algorithimic word stemming. Words like 'query' and 'queries' are both stemmed as 'queri'. ... The tsvector type stores the location of a word stem. 'queri':10 is the 10th word in line 44, the first result returned by the query. ... The to_tsquery() function parses words into word stems. ...