I‘m a bit confused – what exactly does the “large“ and “small“ refer to? If the existence of meaning is the criteria, then Asena is right of course. However; I took it a bit more literal and therefore my answer was, that none is generally bigger or smaller than the other, for a morpheme can consist of a single phoneme and so can a syllable. Likewise; a morpheme can be a whole word, but so can a syllable. Could someone please clarify this for me? 🙂