Nouns

(n)overlap, convergence, intersectiona representation of common ground between theories or phenomena“there was no overlap between their proposals”
(n)overlapthe property of partial coincidence in time
(n)lap, overlapa flap that lies over another part“the lap of the shingles should be at least ten inches”

Verbs

(v)overlapcoincide partially or wholly“Our vacations overlap”
(v)overlapextend over and cover a part of“The roofs of the houses overlap in this crowded city”