While this seems like (and may very well have been meant as) a silly nonsense question, there are serious things to say about which "word" would seem larger to a native speaker in direct comparison, in light of sound symbolism effects. Compare with the bouba/kiki effect, in which people consistently identify meanings of made-up words according to their sound values.
In particular, the English morpheme ka-, a variant of ker-, is "The first element in numerous onomatopœic or echoic formations intended to imitate the sound or the effect of the fall of some heavy body". This suggests an association with ponderous bulk.
In contrast, squ- /skw/ can be considered a phonestheme associated with small size: consider squeak, the sound of various small animals, and squirrel, a small rodent. Further, /i/ is cross-linguistically associated with small size.