It can be used as an adverb, a noun, or even a preposition.

Preposition: With the exception of; except; save:
No one replied but me.

Noun: Buts, reservations or objections:
You'll do as you're told, no buts about it.

Adverb: Only; just:
There is but one God.

This three letter word holds the power to change everything and lie to ourselves.

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Keep it short and simple... We've all Kissed BUT.