They are two different countries! Even though they might share some tradition and language, the question in effect is the same as asking the difference between America and Australia :)
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Portugal is west of Spain, between Spain and the Atlantic Ocean.
Portugal is bounded by the Atlantic Ocean and by Spain.
Spain is the only country that borders Portugal.
Spain wished to compete with Portugal for trade. (Apex)
Spain extends both farther north and farther south than Portugal does.
Portugal is certainly smaller than Spain. Portugal is 92,345km2 while Spain takes up 505, 992km2 making Spain more than 5 times as big as Portugal. Additionally, this can be seen when looking at a map: Spain takes up more than 3 quarters of the Iberian peninsula (a peninsula solely split between Portugal and Spain).
Spain is known as Spain and Portugal as Portugal.
Portugal is west of Spain, between Spain and the Atlantic Ocean.
Spain and Portugal both sponsored him
Portugal is bounded by the Atlantic Ocean and by Spain.
Portugal is west of Spain.
Spain is 505,000 square kilometers and Italy is 301,000 square kilometers. Spain has 46,000,000 people and Italy has 61,000,000 people. Pay your money and take your pick.
Spain is the only country that borders Portugal.
Portugal is west of Spain.
Spain wished to compete with Portugal for trade. (Apex)
Spain extends both farther north and farther south than Portugal does.
Spain borders Portugal along the west side and France on the north.