that vs whosoever

that

pron
  • (plural that) Which, who; representing a subject, direct object, indirect object, or object of a preposition. 

  • The known (thing); used to refer to something just said. 

  • That's my car over there. 

  • The thing, person, idea, quality, event, action, or time indicated or understood from context, especially if more remote geographically, temporally or mentally than one designated as "this", or if expressing distinction. 

  • The aforementioned quality or proposition; used to emphatically affirm or deny a previous statement or question. 

  • Used in place of relative adverbs such as where or when; often omitted. 

det
  • The (thing, person, idea, etc) indicated or understood from context, especially if more remote physically, temporally or mentally than one designated as "this", or if expressing distinction. 

conj
  • Introducing a subordinate clause expressing a reason or cause: because, in that. 

  • Introducing — especially, but not exclusively, with an antecedent like so or such — a subordinate clause expressing a result, consequence, or effect. 

  • Introducing a subordinate clause modifying an adverb. 

  • Introducing a clause which is the subject or object of a verb (such as one involving reported speech), or which is a complement to a previous statement. 

  • Introducing an exclamation expressing a strong emotion such as sadness or surprise. 

adv
  • To such an extent; so. (in positive constructions). 

  • To a given extent or degree. 

  • To a great extent or degree; very, particularly (in negative constructions). 

noun
  • Something being indicated that is there; one of those. 

whosoever

pron
  • Whatever person or persons: emphasised or elaborated form of whoever. 

How often have the words that and whosoever occurred in a corpus of books? (source: Google Ngram Viewer )