Note: these 'words' (valid or invalid) are all the permutations of the word pur. These words are obtained by scrambling the letters in pur.
Definitions and meaning of pur
Dated form of purr (low murmuring sound as of a cat)
1895, Jacob Mendes Da Costa, Medical diagnosis (page 294)
The first — called by Laennec, from its resemblance to the pur of a cat, the purring tremor — is nearly always indicative of a valvular lesion. The second is caused by the to-and-fro motion of a roughened pericardium.
pur (third-person singular simple presentpurs, present participlepurring, simple past and past participlepurred)
Dated form of purr
(Can we date this quote by John G. C. Brainard and provide title, author's full name, and other details?)
And there the wild-cat purs amid her brood.
1840, The Visitor: Or, Monthly Instructor (page 182)
It appears to me, past all doubt, that its [the goatsucker's] notes are formed by organic impulse, by the parts of its windpipe formed for sound, just as cats pur.
Pru, RUP, U-RP, urp
From Middle High Germanbūre, gibūre, from Old High Germangibūro, from būr(“peasant”). Cognate with GermanBauer, Dutchbuur, Englishbower.
(Gressoney, Carcoforo) farmer
“pur” in Patuzzi, Umberto, ed., (2013) Ünsarne Börtar [Our Words], Luserna, Italy: Comitato unitario delle linguistiche storiche germaniche in Italia / Einheitskomitee der historischen deutschen Sprachinseln in Italien