Smile does a lot more than simply letting the world know you are happy. It makes you more attractive, look younger and it also has numerous health benefits. Smiling can benefit perception at work, social life and in fact your smile can make other people happy. A smile can go a long way than just showing affection especially health-wise. Flashing just a grin of smile brings out affection, wins you friends and it thickens relationships and bonds of friendship.
Very similar they both are; but there is thin line that separates the two words.
Sometime – as an adverb (not comparable) means at an unstated or indefinite time in the future.