porch vs deck

porch and deck both are nouns.

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

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

porch: a structure attached to the exterior of a building often forming a covered entrance
deck: a porch that resembles the deck on a ship

Other hyponyms of porch include back porch, front porch, portico, stoep, stoop, gallery, veranda, verandah.

porch (noun)	deck (noun)
a structure attached to the exterior of a building often forming a covered entrance	any of various platforms built into a vessel
	street name for a packet of illegal drugs
	a porch that resembles the deck on a ship
	a pack of 52 playing cards