Did you mean: extender, extended, extensor, extensive?

overlap (v.)youdaoicibaDictYouDict[overlap 词源字典]
"to partially extend over," 1726, over- + lap (v.). Related: Overlapped; overlapping.[overlap etymology, overlap origin, 英语词源]
overreach (v.)youdaoicibaDictYouDict
c. 1300, "to reach above or beyond" (transitive), from over- + reach (v.). Meaning "to extend over something, to cover it" is from c. 1400. Sense of "to reach beyond one's strength" is from 1560s. As a noun from 1550s. Related: Overreached; overreaching.