Answer:
Free verse does not mean that anything goes; free verse uses key repetitions of words or key placements of words. What is Blank Verse? Non rhyming lines (hence "blank") all in a regular meter, usually in iambic pentameter.
Both blank verse and free verse are free from rhyme scheme. But, whereas blank verse does have a consistent meter, usually iambic pentameter, that creates a du-DUM rhythm effect, free verse is free from both meter and rhyme. It is free from the limitations of verse poetry.