What is the correct definition of a word root

A root of a word is the basis of a word which can be combined with prefixes and suffixes. for example,  the root of the word conformity is form, with a prefix con- and a suffix -ity.

blank verse is often confused with free verse. free verse avoids traditional poetic forms such as rhyme schemes and conventional metres and can follow any pattern the poet wishes which means that the verses and lines can differ in length as the poet chooses. however blank verse like free verse is also unrhymed but each line in blank verse has roughly the same number of stresses and syllables, usually following the iambic pentameter

misty passage from the question