eructation

It’s a reflex which expels gas, maybe, noisily, from the stomach through the mouth.

Phew! Our teacher gave a disgraceful eructation in our class.

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Eructation

A burp, belch.

Person 1: Woah! Did you hear that eructation!
Person 2: Yeah it was mega loud!

Eruction

Instant ejaculation following the emergence of a boner. One gets an erection and ejaculates seemingly simultaneously.

Dude, I just had an eruction.

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eruct

The past tense of erect.

Man, I wish she stayed longer, I was eruct a minute ago.