Okla. Stat. tit. 16, § 14

The words "land," "real estate" and "premises" when used herein or in any instrument relating to real property, are synonyms and shall be deemed to mean the same thing, and unless otherwise qualified, to include lands, tenements and hereditaments; and the word "appurtenances" unless otherwise qualified shall mean all improvements and every right of whatever character pertaining to the premises described.