man-of-the-earth vs Ipomoea leptophylla

man-of-the-earth and Ipomoea leptophylla both are nouns.

Word	Noun	Adjective	Verb	Adverb
man-of-the-earth	Yes	No	No	No
Ipomoea leptophylla	Yes	No	No	No

As nouns, man-of-the-earth and Ipomoea leptophylla are synonyms defined as:

man-of-the-earth and Ipomoea leptophylla: a morning glory with long roots of western United States

man-of-the-earth (noun)	Ipomoea leptophylla (noun)
tropical American prostrate or climbing herbaceous perennial having an enormous starchy root; sometimes held to be source of the sweet potato	a morning glory with long roots of western United States
a morning glory with long roots of western United States