youth-on-age vs Tolmiea menziesii

youth-on-age and Tolmiea menziesii both are nouns.

Word	Noun	Adjective	Verb	Adverb
youth-on-age	Yes	No	No	No
Tolmiea menziesii	Yes	No	No	No

As nouns, youth-on-age and Tolmiea menziesii are synonyms defined as:

youth-on-age and Tolmiea menziesii: vigorous perennial herb with flowers in erect racemes and having young plants develop at the junction of a leaf blade and the leafstalk

Other synonyms of youth-on-age include pickaback plant, piggyback plant.

youth-on-age (noun)	Tolmiea menziesii (noun)
vigorous perennial herb with flowers in erect racemes and having young plants develop at the junction of a leaf blade and the leafstalk	vigorous perennial herb with flowers in erect racemes and having young plants develop at the junction of a leaf blade and the leafstalk