nonstop vs relentless

nonstop

• Without stopping; without interruption or break. 

• Describing a point mutation within a stop codon that causes the continued translation of an mRNA strand. 

• Without stopping; without interruption or break 

• A linguistic sound that is not a stop; a continuant. 

• A convenience store in parts of Europe, open 24 hours a day. 

• A nonstop journey, especially a nonstop flight. 

relentless

• Unremitting, steady and persistent. 

• Unrelenting or unyielding in severity.