portulaca vs flower

portulaca and flower both are nouns.

Word	Noun	Adjective	Verb	Adverb
portulaca	Yes	No	No	No
flower	Yes	No	Yes	No

As nouns, flower is a hypernym of portulaca; that is, flower is a word with a broader meaning than portulaca:

portulaca: a plant of the genus Portulaca having pink or red or purple or white ephemeral flowers
flower: a plant cultivated for its blooms or blossoms

portulaca (noun)	flower (noun)
a plant of the genus Portulaca having pink or red or purple or white ephemeral flowers	a plant cultivated for its blooms or blossoms
	reproductive organ of angiosperm plants especially one having showy or colorful parts
	the period of greatest prosperity or productivity

portulaca (verb)	flower (verb)
	produce or yield flowers