sunderern.
/ˈsʌnd(ə)rə/, U.S. /ˈsənd(ə)rər/ A person who or thing which causes separation, splitting up, or division.
ΘΚΠ
the world > relative properties > wholeness > mutual relation of parts to whole > separation > [noun] > one who or that which separates > one who
sequestrator1654
severer1662
sunderer1838
1838 Liberator (Boston) 21 Dec. Thou promoter of human banishment, and sunderer of the strong ties of native country.
1888 G. Meredith Reading of Earth in Poems (1898) II. 144 We may cry to the Sunderer, spare That dearest!
1951 G. Lannestock tr. V. Moberg Emigrants x. 158 It had been overrun early by dissenters, sunderers of religion.
1996 Weekly Standard 29 Apr. (Books section) 34 By ceasing to require fault on the part of either spouse, the law sides with the sunderers of families.
This entry has been updated (OED Third Edition, January 2018; most recently modified version published online March 2022).
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n.1838