Loan = (1) (noun) a sum of money that you borrow, usually from a bank: ‘They are currently negotiating a $10 million loan.’ (2) (verb) lend a painting, work of art etc. to an art gallery or museum: ‘The pictures have been loaned to the National Gallery for the forthcoming exhibition.’ (3) (verb, especially in American English) let someone use something; lend: ‘Why don’t you ask John if he’ll loan you his car.’
Borrow = receive money or something that a bank or person agrees to lend you: ‘By the end of the war the Canadian government had borrowed over $5 million from its own citizens.’