The term 'Junior, to Senior' refers to a progression in job titles. The crossword solutions for this term are 'SON' (3 letters) and 'NAMESAKE' (8 letters). This progression is often seen in family businesses, where the SON of the founder or current senior takes on the role of junior and eventually works their way up to the senior position. It can also be seen in other industries, where an individual starts as a junior and works their way up to the senior level.