Researchful is valid Scrabble Word

Is researchful a scrabble word?
Official Scrabble Players Dictionary NO
Official Tournament and Club Word List NO
Collins Scrabble Words YES
Is researchful valid Words with Friends?
Words with Friends NO

11 letters word
19 points in Scrabble
21 points in WWF

Definitions for RESEARCHFUL in dictionary:

ADJECTIVE:

full of research
Making researches; inquisitive.

Similar words containing SEARCH without suffix ful and without prefix re

search11 research13 searched14 searcher13 searches13 searchers14 searching15 researched16 researcher15 researches15 searchable17 searchings16 searchless15 unsearched16 wordsearch19 researchers16 researching17 researchist16 searchingly20 searchlight20 coresearcher19 researchable19 researchists17 searchlights21 unsearchable19 unsearchably22 wordsearches21 coresearchers20 searchingness19 unsearchables20 searchability23 searchingnesses21 searchabilities22

Find what other words can be done using letters: "researchful"
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