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"Yatha butha" and "Thathata" are pali terms for Reality.
By referring SuttaCentral website,
Definition for the pāli word Yathābhūtaṃ
yathābhūtaṃ adv. in truth; in reality; in its real essence.
As Butha,
Definition for the pāli word Bhucca
bhūta] only in cpd. yathā—bhuccaṁ (nt. adv.) as it is, that which really is, really (=yathā bhūtaṁ) Th 2, 143 … 143. See under yathā.
As Thatha
Definition for the pāli word Tathatta
M i.468.—abl. tathattā in truth, really Sn 520 sq. (cp. M Vastu iii.397). tathatta nt. the state of … Tathatta (nt.) [*tathātvaṁ] "the state of being so," the truth, Nibbāna; only in foll. phrases: (a)
Most common terms used to clarify reality are "Anicha, Dukka, Anatha". "Sunya and Pathichasamuthpanna" also can be used.