Which sound device is expressed by the words?

Roses are red
Violets are blue

This phrase does not express any specific sound device. It is a simple rhyme.

The sound device expressed by the words "Roses are red, Violets are blue" is called "rhyme."

The sound device expressed by the words "Roses are red, Violets are blue" is rhyme.

To identify the sound device of rhyme, you need to pay attention to the end sounds of each line. In this case, you can see that the words "red" and "blue" rhyme with each other, indicating the use of rhyme. The similar ending sounds create a pleasing and rhythmic effect in the poem.