ale vs porter's beer

ale and porter's beer both are nouns.

Word	Noun	Adjective	Verb	Adverb
ale	Yes	No	No	No
porter's beer	Yes	No	No	No

As nouns, porter's beer is a hyponym of ale; that is, porter's beer is a word with a more specific, narrower meaning than ale:

ale: a general name for beer made with a top fermenting yeast; in some of the United States an ale is (by law) a brew of more than 4% alcohol by volume
porter's beer: a very dark sweet ale brewed from roasted unmalted barley

Other hyponyms of ale include Weissbier, wheat beer, white beer, bitter, Burton, pale ale, porter, stout.

ale (noun)	porter's beer (noun)
a general name for beer made with a top fermenting yeast; in some of the United States an ale is (by law) a brew of more than 4% alcohol by volume	a very dark sweet ale brewed from roasted unmalted barley