portal site vs portal

portal site and portal both are nouns.

Word	Noun	Adjective	Verb	Adverb
portal site	Yes	No	No	No
portal	Yes	No	No	No

As nouns, portal site and portal are synonyms defined as:

portal site and portal: a site that the owner positions as an entrance to other sites on the internet

portal site (noun)	portal (noun)
a site that the owner positions as an entrance to other sites on the internet	a grand and imposing entrance (often extended metaphorically)
	a short vein that carries blood into the liver
	a site that the owner positions as an entrance to other sites on the internet