The term 'more primitive' can be described by two crossword solutions: 'EARLIER' (7 letters) and 'RUDER' (5 letters). Primitive is an adjective that is used to describe something that is simple or undeveloped, often in comparison to something more advanced. Therefore, the term 'more primitive' implies that something is less developed than something else, and the two crossword solutions of 'EARLIER' and 'RUDER' support this definition.