I am not falling, what am I with zero?

I am not falling!!

• With zero I listen.
• With two I growl.
• With four I am close.
• With seven I spin.
• With twenty I flow.

What am I with zero?

You are an

EAR!!

With zero I listen.

An 'ear' listens

With two I growl.

A 'bear' growls

With four I am close.

A 'dear' person is close to you

With seven I spin.

A 'gear' spins

With twenty I flow.

A 'tear' flows

And also, per the title

An ear does not fall, and would be a bit worrying if it did!

Is it

Ear?

Bear Dear Gear Tear

• Wow beat you to it be 10 seconds, very close :) – Beastly Gerbil Sep 3 '20 at 15:33
• Story of my life :) – DrD Sep 3 '20 at 15:34
• Correct but please add spoiler tags! Replace > with >! – Stef Sep 3 '20 at 15:36
• Not sure how to do it – DrD Sep 3 '20 at 15:56
• You have 24k reputation how can that be – user71173 Sep 3 '20 at 15:57