In the last subsection of this type we look for words containing other special characters: , ( ) % & $
" ' + * = / _
Depending on the language some of these characters may be allowed within words, other will not. If words with forbidden characters do not have very low frequency there might be a problem in preprocessing.
Words containing %:
select w_id-100,freq, word from words where w_id>100 and word like "%\%%" limit 10;
3.12.1 Words with Hyphens
3.12.2 Multiwords
3.12.3 (Multi-)Words with dots