overlap
noun
a representation of common ground between theories or phenomena
“there was no overlap between their proposals”
the property of partial coincidence in time
a flap that lies over another part
“the lap of the shingles should be at least ten inches”
Synonymslap
verb
coincide partially or wholly
“Our vacations overlap”
extend over and cover a part of
“The roofs of the houses overlap in this crowded city”
Source: WordNet 3.1, Princeton University