SEARCH-WORDLIST SEARCH-ALSO-VOC SEE
SEARCH-WORDLIST ( str-ptr str-len voc -- 0 | xt 1 | xt -1 )  
ansi 16.6.1.2192 <SEARCH-ORDER>
almost like FIND or (FIND) -- but searches only the specified vocabulary.

reference: p4_search_wordlist in ../src/search.c:0070, export CO SEARCH-WORDLIST