Answer:
A rhyme is just two words that sound similar. Like cat and bat or pet and bet. A poem is larger than that... it's a bigger group of words arranged into lines and stanzas which usually paints kind of a picture... of an emotion, or a moment in time, or something more complicated. Sometimes poems rhyme, but they don't have to. Sometimes they have a form with a certain number of syllables, or a rhyme scheme that involves complicated rhymes on certain lines only... or sometimes they don't have any form at all other than whatever the author gives them.