portion vs share

portion

verb
  • To divide into amounts, as for allocation to specific purposes. 

  • To endow with a portion or inheritance. 

noun
  • An allocated amount. 

  • That which is divided off or separated, as a part from a whole; a separated part of anything. 

  • One's fate; lot. 

  • A wife's fortune; a dowry. 

  • The part of an estate given or falling to a child or heir; an inheritance. 

share

verb
  • To divide and distribute. 

  • To give part of what one has to somebody else to use or consume. 

  • To tell to another. 

  • To allow public or private sharing of computer data or space in a network 

  • To have or use in common. 

noun
  • The action of sharing something with other people via social media. 

  • The cutting blade of an agricultural machine like a plough, a cultivator or a seeding-machine. 

  • A configuration enabling a resource to be shared over a network. 

  • A financial instrument that shows that one owns a part of a company that provides the benefit of limited liability. 

  • A portion of something, especially a portion given or allotted to someone. 

  • The sharebone or pubis. 

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