sod

(noun) surface layer of ground containing a mat of grass and grass roots. Synonyms: turf, sward, greensward.

(noun) an enzyme that catalyzes the conversion of superoxide into hydrogen peroxide and oxygen. Synonyms: superoxide dismutase, SOD. Example: "Oxygen free radicals are normally removed in our bodies by the superoxide dismutase enzymes."

(noun) someone who engages in anal copulation (especially a male who engages in anal copulation with another male). Synonyms: sodomite, sodomist, bugger.

(noun) an informal British term for a youth or man. Example: "The poor sod couldn't even buy a drink."

(verb) cover with sod.