Greater in degree of what acts or deeds, or labor? It is yet curiously 
subjective to one's belief structure. I'm still not sure how we can "top" 
Christ's deed of power, number I can see that. He was in ministry, as it 
were, for a few short years  stacked against the generations to come which 
I think he referred. Interesting isn't it.

Greater...
NT:3185
meizon (mide'-zon); neuter of NT:3187; (adverbially) in greater degree:

KJV - the more.

Works...
NT:2041
ergon (er'-gon); from a primary (but obsolete) ergo (to work); toil (as an 
effort or occupation); by implication, an act:

KJV - deed, doing, labour, work.