overlap

(noun) a representation of common ground between theories or phenomena. Synonyms: convergence, intersection. Example: "There was no overlap between their proposals."

(noun) the property of partial coincidence in time.

(noun) a flap that lies over another part. Synonyms: lap. Example: "The lap of the shingles should be at least ten inches."

(verb) coincide partially or wholly. Example: "Our vacations overlap."

(verb) extend over and cover a part of. Example: "The roofs of the houses overlap in this crowded city."