portal vs portal site

portal and portal site both are nouns.

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

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

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

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