Yes, the noun 'Pa' can be the subject of a sentence.
The noun 'Pa' is a proper noun as the title of a father, a grandfather, or other male in a parental role.
Example: Pa told me to finish my homework.
does a beneficiary of an annuity pay pa inheritance tax
Shaozhen Kuang has written: 'Ti qi yin hang, pa pa' -- subject(s): Shipping
Luther W. Minnigh has written: 'Gettysburg: \\' -- subject(s): Gettysburg, Battle of, Gettysburg, Pa., 1863 'The Gettysburg knapsack' -- subject(s): Gettysburg, Battle of, Gettysburg, Pa., 1863
Pa l Greguss has written: 'Xylotomischer Bestimmungsschlu ssel der Pinus Arten' -- subject(s): Pine
Grags-pa-rgyal-mtshan has written: 'Selected writings of Sa-skya Rje-btsun Grags-pa-rgyal-mtshan' -- subject(s): Early works to 1800, Sa-skya-pa (Sect)
William J. Lowe has written: 'Donegal Reformed Church at Milton Grove' -- subject(s): Maytown, Pa. Reformed Church, Milton Grove, Pa. Donegal Reformed Church, Pa Maytown, Pa Milton Grove
Qichang Shen has written: 'Yingzhou gu tiao' -- subject(s): Pi pa music, Instruction and study, Pi pa
Max Pa sler has written: 'Mechanik deformierbarer Ko rper' -- subject(s): Elasticity, Fluid mechanics, Deformations (Mechanics)
Michael Shaara has written: 'The killer angels' -- subject(s): Gettysburg, Battle of, Gettysburg, Pa., 1863, Juvenile fiction, Fiction 'The killer angels' -- subject(s): Gettysburg, Battle of, Gettysburg, Pa., 1863, Fiction, Juvenile fiction 'The killer angels /cby Michael Shaara ; maps by Don Pitcher' 'The broken place' 'For love of the game' 'The killer angels' -- subject(s): Accessible book, Gettysburg, Battle of, Gettysburg, Pa., 1863, Gettysburg (Pa.), Battle of, 1863, History, Fiction
Robert Lorenzo Clark has written: 'History of Centre Presbyterian Church, New Park, Pa., 1780-1903' -- subject(s): New Park (Pa.), New Park (Pa.) Centre Presbyterian Church
Pa draig O Riaga in has written: 'Public and teacher attitudes towards Irish in the schools' -- subject(s): Irish language, Revival
Cathy McIntosh has written: 'A bicentennial history of Mt. Carmel Presbyterian Church, Alquippa, Beaver Co., Pa' -- subject(s): Aliquippa (Pa.), Church history, History, Mt. Carmel Presbyterian Church (Aliquippa, Pa.)