You think me a LOON? ;)
Two vowels is the limit for similar words I can imagine. Perhaps a later poster can come up with a three vowel four letter word. I can think of agee, aura, avia (Latin), eire, and a few others.

A LONE vowel was all I wanted. . . . :(

LONG only contains one vowel. :D

So does GONG,,,

Does your gong go "BONG"?

Sure. Since the Big BANG time at least :)

You RANG?
.........

I SANG, somebody else must have rang!

Is it a SANE policy to keep jumping from one subject to another so often?

After a while your concern will WANE.

Open a bottle of WINE, and we'll toast the mice, superheros, and horses that came before.

Just don't toast too often, or they will classify you as a WINO.

... together with your TWIN brother, who is a teetotaller, so does not deserve such an epithet.

CyberSmurf has a twin brother? ...is this a WIND up?

Where do we FIND the twin -- or is it a doppelganger?

Actually I do have a twin brother than I'm rather FOND of.

Did your parents set up a special offshore FUND for the twin boys?

Our family never had to FEND off accusations of wealth.

So they didn't SEND a lot of funds into secret Swiss bank accounts?

No, Dad barely had enough money to TEND to our needs at home.

n55b tried to BEND the rules, transforming tend into tiny, so I'm ignoring his/her post :p

My mistake wasn't tiny, so I decided to REND that erroneous post.

Apology READ and accepted

That post is DEAD and gone.

Just as well! ..it went down like a LEAD balloon!

Thump -- a hard blow to the HEAD and down I go.

.... and land on the garden SHED

overturning a bag of SEED

And all that because you did not take HEED of the 'do not lean out' notice in the baloon

I'll bet he really didn't NEED you to tell him that

Contrariwise: I expected a MEED of gratitude ....

that would have been a MEEK thing to do

But would it be the GEEK thing to do?

Okay, I had to SEEK "meed" in the dictionary.

So you had to PEEK in the dictionary? That's definitely a geek thing to do!

I had to PEER through all the clutter to get to the definitions.

Grab a BEER and all will be better.

unless a BEAR grabs you.... But I'm sure Batman will come to the rescue in this unfortunate case

Then you should hope he is NEAR you. Since he sold his Batmobile, he has to get there on his cane.

I HEAR you.