whirl vs round shape

whirl and round shape both are nouns.

Word	Noun	Adjective	Verb	Adverb
whirl	Yes	No	Yes	No
round shape	Yes	No	No	No

As nouns, round shape is a hypernym of whirl; that is, round shape is a word with a broader meaning than whirl:

whirl (noun)	round shape (noun)
a usually brief attempt	a shape that is curved and without sharp angles
the act of rotating rapidly
confused movement
the shape of something rotating rapidly

whirl (verb)	round shape (verb)
flow in a circular current, of liquids
turn in a twisting or spinning motion
cause to spin
fly around
revolve quickly and repeatedly around one's own axis