overlapping vs lapping

overlapping and lapping both are nouns.

Word	Noun	Adjective	Verb	Adverb
overlapping	Yes	No	No	No
lapping	Yes	No	No	No

As nouns, overlapping and lapping are synonyms defined as:

overlapping and lapping: covering with a design in which one element covers a part of another (as with tiles or shingles)

Other synonyms of overlapping include imbrication.

overlapping (noun)	lapping (noun)
covering with a design in which one element covers a part of another (as with tiles or shingles)	covering with a design in which one element covers a part of another (as with tiles or shingles)