youth-on-age vs piggyback plant

youth-on-age and piggyback plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
youth-on-age	Yes	No	No	No
piggyback plant	Yes	No	No	No

As nouns, youth-on-age and piggyback plant are synonyms defined as:

youth-on-age and piggyback plant: 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, Tolmiea menziesii.

youth-on-age (noun)	piggyback plant (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