porridge vs oatmeal

porridge and oatmeal both are nouns.

Word	Noun	Adjective	Verb	Adverb
porridge	Yes	No	No	No
oatmeal	Yes	No	No	No

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

porridge: soft food made by boiling oatmeal or other meal or legumes in water or milk until thick
oatmeal: porridge made of rolled oats

Other hyponyms of porridge include hasty pudding, gruel, burgoo.

porridge (noun)	oatmeal (noun)
soft food made by boiling oatmeal or other meal or legumes in water or milk until thick	porridge made of rolled oats
	meal made from rolled or ground oats