Thermionics is valid Scrabble Word

Is thermionics a scrabble word?
Official Scrabble Players Dictionary YES
Official Tournament and Club Word List YES
Collins Scrabble Words YES
Is thermionics valid Words with Friends?
Words with Friends YES

Definitions for THERMIONICS in dictionary:

Similar words containing IONIC without suffix s and without prefix therm

ionic7 bionic10 ionics8 pionic10 anionic9 avionic12 bionics11 psionic11 thionic12 amnionic12 avionics13 cationic12 ionicity13 nepionic12 nonionic10 psionics12 talionic10 chorionic16 dithionic15 fermionic16 propionic15 radionics12 vibrionic16 ionically14 ganglionic14 histrionic15 interionic12 ionicities12 scorpionic16 thermionic17 trithionic15 bionically17 histrionics16 cationically19 histrionical17 zwitterionic26 histrionicism20 preganglionic19 histrionically22 histrionicisms21 postganglionic20
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