BUT' AND THEN (4 letters) The crossword solutions for the term 'BUT THEN' are 'YET' (3 letters) AND 'BUT' (4 letters). 'YET' is an adverb that is used to express a contrast between what has been said or done AND what is about to be said or done. It is often used to introduce a statement that is contrary to what has already been said or done. 'BUT' is a conjunction that is used to introduce a contrasting statement or idea. It is often used to indicate a change in direction or thought. Together, 'BUT THEN' is used to express a contrast between two ideas or statements.