althea vs white mallow

althea and white mallow both are nouns.

Word	Noun	Adjective	Verb	Adverb
althea	Yes	No	No	No
white mallow	Yes	No	No	No

As nouns, white mallow is a hyponym of althea; that is, white mallow is a word with a more specific, narrower meaning than althea:

althea: any of various plants of the genus Althaea; similar to but having smaller flowers than genus Alcea
white mallow: European perennial plant naturalized in United States having triangular ovate leaves and lilac-pink flowers

Other hyponyms of althea include Althea officinalis, marsh mallow.

althea (noun)	white mallow (noun)
any of various plants of the genus Althaea; similar to but having smaller flowers than genus Alcea	European perennial plant naturalized in United States having triangular ovate leaves and lilac-pink flowers