oblate vs pumpkin-shaped

oblate is a noun but pumpkin-shaped is not a noun.

Word	Noun	Adjective	Verb	Adverb
oblate	Yes	Yes	No	No
pumpkin-shaped	No	Yes	No	No

As adjectives, oblate and pumpkin-shaped are synonyms defined as:

oblate and pumpkin-shaped: having the equatorial diameter greater than the polar diameter; being flattened at the poles

oblate (noun)	pumpkin-shaped (noun)
a lay person dedicated to religious work or the religious life

oblate (adjective)	pumpkin-shaped (adjective)
having the equatorial diameter greater than the polar diameter; being flattened at the poles	having the equatorial diameter greater than the polar diameter; being flattened at the poles