portico vs porch

portico and porch both are nouns.

Word	Noun	Adjective	Verb	Adverb
portico	Yes	No	No	No
porch	Yes	No	No	No

As nouns, porch is a hypernym of portico; that is, porch is a word with a broader meaning than portico:

portico: a porch or entrance to a building consisting of a covered and often columned area
porch: a structure attached to the exterior of a building often forming a covered entrance

portico (noun)	porch (noun)
a porch or entrance to a building consisting of a covered and often columned area	a structure attached to the exterior of a building often forming a covered entrance