Yes, I believe the terms are similar. So, is Romeo as dynamic character? In the sense that he changes from a love-sick, depressed young man obsessed over someone who clearly does not return his affections into a love-sick, ELATED, happy young man in love with a young woman who feels the same way about him, yes, he is dynamic. Is Romeo a "round" character? This term means that he is complex, as humans beings are. In other words, does he appear to be a real person? He is fickle, changeable in his emotions, as many young men can be. He is a good friend to several, diverse young men which seems entirely realistic. They certainly behave in a typical way on the way to the party. They kid each other much like most teenage boys. He has a temper when one of his friends (Mercutio) is victimized and seeks revenge. That is a human response. He seeks out the advice of a mentor rather than confide in his parents. That, also, seems typical behavior. So, although, Romeo may be primarily a vehicle for Shakespeare's theme of the role of fate in tragedy, he is drawn carefully by the playwright to appear believable.