leavening agent vs leaven agent

leavening agent and leaven agent both are nouns.

Word	Noun	Adjective	Verb	Adverb
leavening agent	Yes	No	No	No
leaven agent	Yes	No	No	No

As nouns, leavening agent and leaven agent are synonyms defined as:

leavening agent and leaven agent: A leavening agent (also known as raising agent or leaven agent) is a substance added to dough or batter to make it lighter and softer.

Other synonyms of leavening agent include raising agent.

leavening agent (noun)	leaven agent (noun)
A leavening agent (also known as raising agent or leaven agent) is a substance added to dough or batter to make it lighter and softer.	A leavening agent (also known as raising agent or leaven agent) is a substance added to dough or batter to make it lighter and softer.