Is ‘theory’ a Scrabble US Word? Yes
Is ‘theory’ a Scrabble UK Word? Yes
Is ‘theory’ a Words With Friends Word? Yes
Is ‘theory’ an Adjective? No
Is ‘theory’ an Adverb? No
Is ‘theory’ a Noun? Yes
Is ‘theory’ a Verb? No
a well-substantiated explanation of some aspect of the natural world;
an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena;
a concept that is not yet verified but that if true would explain certain facts or phenomena;
"he proposed a fresh theory of alkalis that later was accepted in chemical practices"
"the architect has a theory that more is less"
"they killed him on the theory that dead men tell no tales"

See also: Words That Rhyme With THEORY →