The bulk update request #11485 is pending approval.

create alias nippl (0) -> nipples (1387597)
create alias nippel (34) -> nipples (1387597)

Reason: Aliases away the two most common remaining nipple typos.

Tag history:
https://e621.net/post_versions?commit=Search&search%5Btags_added%5D=nippl
https://e621.net/post_versions?commit=Search&search%5Btags_added%5D=nippel

nippless is omitted despite being tagged often since there is some ambiguity whether it is meant to be nipples or nipple-less.