entry vs portal

entry and portal both are nouns.

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

As nouns, portal is a hyponym of entry; that is, portal is a word with a more specific, narrower meaning than entry:

entry (noun)	portal (noun)
the act of entering	a grand and imposing entrance (often extended metaphorically)
the act of beginning something new	a short vein that carries blood into the liver
something that provides access (to get in or get out)	a site that the owner positions as an entrance to other sites on the internet
something (manuscripts or architectural plans and models or estimates or works of art of all genres etc.) submitted for the judgment of others (as in a competition)
an item inserted in a written record
a written record of a commercial transaction