lapping vs overlapping

lapping and overlapping both are nouns.

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

As nouns, lapping and overlapping are synonyms defined as:

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

Other synonyms of lapping include imbrication.

lapping (noun)	overlapping (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)