pebble plant vs fig marigold

pebble plant and fig marigold both are nouns.

Word	Noun	Adjective	Verb	Adverb
pebble plant	Yes	No	No	No
fig marigold	Yes	No	No	No

As nouns, pebble plant and fig marigold are synonyms defined as:

pebble plant and fig marigold: any of several South African plants of the genus Mesembryanthemum cultivated for showy pink or white flowers

pebble plant (noun)	fig marigold (noun)
any of several South African plants of the genus Mesembryanthemum cultivated for showy pink or white flowers	any of several South African plants of the genus Mesembryanthemum cultivated for showy pink or white flowers