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The wildcard character (% , _) usage
1 . %
Matches the preceding element zero or more times. For example, ab%c matches "abac", "abiotic", "abulic", etc.
2 . _
Matches any single character. For example, a__c matches "abac", etc.
All words beginning with "a" : a%
All words beginning with "a" : %a
All the words that contain "a" : %a%
Three-letter words starting with "a": a__
Three-letter words ending with "a" : __a
Four-letter words coming second "a" : _a__
Six-letter words coming second "a" and fourth "b" : _a__b_
All words containing "a" and following "b" : %a%b%
All words containing "a" and following next to ending "b" :%a%b_
By touching a word entry In the search result words, you can look up the word definition of Wiktionary, the free dictionary.