Very and really are adverbs. Lovely and nice are adjectives. You can say very lovely or very nice. You can say really lovely or really nice. You can also call something lovely or nice without an adverb. It depends on the context and what meaning you wish to convey. Very means to a large extent while really expresses a genuine nature. Lovely may have to do with an attractive quality or beauty, something which is enjoyable or delightful. Nice means pleasing or agreeable.