Trierarchal is valid Scrabble Word

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

11 letters word
16 points in Scrabble
17 points in WWF

Definitions for TRIERARCHAL in dictionary:

ADJECTIVE:

relating to a trierarch

Similar words containing ERARCH without suffix al and without prefix tri

xerarch19 hierarch16 overarch16 hierarchs17 hierarchy20 interarch14 trierarch14 heterarchy21 hierarchal18 hierarchic20 overarched19 overarches18 trierarchs15 trierarchy18 hierarchies19 hierarchise19 hierarchism21 hierarchize28 interarched17 interarches16 overarching20 eleutherarch20 heterarchies20 hierarchical22 hierarchised21 hierarchises20 hierarchisms22 hierarchized30 hierarchizes29 interarching18 trierarchies17 eleutherarchs21 hierarchising22 hierarchizing31 hierarchically27 nonhierarchical25 hierarchization32 antihierarchica25 antihierarchical26

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