leaven vs baking powder

leaven and baking powder both are nouns.

Word	Noun	Adjective	Verb	Adverb
leaven	Yes	No	Yes	No
baking powder	Yes	No	No	No

As nouns, baking powder is a hyponym of leaven; that is, baking powder is a word with a more specific, narrower meaning than leaven:

leaven: a substance used to produce fermentation in dough or a liquid
baking powder: any of various powdered mixtures used in baking as a substitute for yeast

Other hyponyms of leaven include sourdough, barm, yeast.

leaven (noun)	baking powder (noun)
an influence that works subtly to lighten or modify something	any of various powdered mixtures used in baking as a substitute for yeast
a substance used to produce fermentation in dough or a liquid

leaven (verb)	baking powder (verb)
cause to puff up with a leaven