prolate vs watermelon-shaped

prolate and watermelon-shaped both are adjectives.

Word	Noun	Adjective	Verb	Adverb
prolate	No	Yes	No	No
watermelon-shaped	No	Yes	No	No

As adjectives, prolate and watermelon-shaped are synonyms defined as:

prolate and watermelon-shaped: having the polar diameter greater than the equatorial diameter

prolate (adjective)	watermelon-shaped (adjective)
having the polar diameter greater than the equatorial diameter	having the polar diameter greater than the equatorial diameter
rounded like an egg