later, afterwards, some time after the present

(spatially) the back, the rear, behind / (temporally) later, afterwards, some time after the present / the rest

one's backside / the back, the rear (both spatially and temporally)

(grammar) postposition

postfix notation

a name (word or phrase indicating a particular person, place, class, or thing) / (more specifically) a given name (excluding the surname)

a back gate / (figuratively) the anus, as a homophone for 肛門 and in contrast to 前門 (zenmon, “front gate”, figurative for vagina)

follow, tag along

(aeronautics) trailing edge

(anatomy) an occiput